Judging from the skins of these two notebooks, these two notebooks have obviously followed Alfred for a long time, and they are definitely often flipped by Alfred. This can be seen from the edge of the already wooled cover.

Yang Jing doesn't understand what the numbers recorded in the book mean. The place names recorded are not known in this time and space because there is no Du Niang, and Wikipedia is not yet known, but Yang Jing knows some of the titles recorded above.

For example, there is a book title in the notebook that records it like this.

"On the Sea Power", 1926...

Then the number 1926 is followed by a series of other Arabic numerals.

Yang Jing really doesn't understand what these numbers mean, but Yang Jing knows the famous "Theory of the Sea Power". This is the work of Alfred Thayer Mahan, a famous American military theorist at the end of the 19th and early 20th centuries.

This book elaborates on the importance of sea control in that era, and was regarded as a classic by navies of various countries before World War I.

However, how could General Ma Han's "Theory of the Sea Power" be involved with Alfred? One of them is a navy and the other is a gunpowder. It cannot be said that it is impossible to be a big deal, but if you want to say that they have a close relationship, Yang Jing himself does not believe it.

If you say that Alfred likes the Navy, it is understandable that he wrote down the name of the book "Theory of the Sea Power" in his notebook. But the question is, what do the numbers behind mean?

It would be okay if it was just a book called "Theory of Haiquan", but in addition to "Theory of Haiquan", there are more inexplicable titles in the notebook, such as this book "National Geography", 08/1931, what's wrong with the series of numbers behind it?

What happened to this book of Charles Louis Montesquieu's "The Spirit of the Law", 1942...?

There is also this book "A Brief Introduction to the Theory of Civilization" written by the Japanese Fukuzawa Yukichi, 1938...

"Theory of Human Nature" written by David Hume, British man, 1940...

......

If most of the above books are philosophical books, Yang Jing can understand it. After all, Alfred was kicked out by his cousin and may have started to study philosophy because of his disheartened heart. This is reasonable, but what about the following books about music, history, art, etc.? What surprised Yang Jing the most was that in this notebook, Yang Jing also found purely academic books such as "The Travels of Mark Polo", Copernicus's "The Operation of the Celestial Body", and Darwin's "Origin of Species". Could it be that after thinking about some philosophy, Alfred was preparing to change his career to study vanishing literature, geography and biology?

What Yang Jing couldn't understand most were the names of those pure literature books, such as the novel "Uncle Tom's Cabin" written by Mrs. Stowe, "Whom the Bell" by Hemingway, and "The Adventures of Tom Sawyer" by Mark Twain...

You said that you can understand those pure literary works, Yang Jing can also understand them, but the problem is that Mark Twain's "The Adventures of Tom Sawyer" is a children's literature...

These books simply don’t match each other, and even Yang Jing thought about it for a long time but couldn’t figure out what connection there was between these books.

However, Yang Jing discovered a secret of numbers from these books, that is, the 19** numbers that followed those books. Yang Jing guessed that this should be the publication date of these books, or in other words, the year they were published.

Based on these numbers, Yang Jing inferred that most of the names of the books recorded in these two notebooks were published in the 1930s to the early 1940s.

This discovery also made Yang Jing immediately realize that the secrets hidden in the two notebooks written by Alfred should have a lot to do with these books.

But with so many book names, Yang Jing should start with where to start for a while.

After looking at the "National Geography" in the notebook, 08/1931 and the series of numbers behind, Yang Jing immediately remembered that when he first came to this basement, he had discovered a set of "National Geography" magazine that had been preserved for half a century in several cardboard boxes.

So he immediately dug out the set of "National Geographic" magazine that he had just sorted out, searched for it for a long time, and then found the magazine that was released in August 1931.

Finding this magazine made Yang Jing excited. Obviously, the titles recorded in the notebook were obviously all those that Alfred had read back then, otherwise he wouldn't have found this magazine here.

So since you have found this magazine, can you find other books recorded in your notebook?

Thinking of this, Yang Jing suddenly remembered that in the large study room on the second floor of the main building, there were many large bookshelves, and most of the books on the bookshelf were old books.

Thinking of this, Yang Jing immediately grabbed the newly found "National Geography" magazine and stood up and left, and soon returned to the large study on the second floor of the main building.

Yang Jing has been here twice. The area is large, with a total area of ​​more than 200 square meters. In addition to several large floor-to-ceiling bookshelfs, there is also a large oak desk near the floor-to-ceiling windows.

Yang Jing started to search for the first bookshelf. Not long after searching, he saw a book of Copernicus's "Theory of the Operation of the Celestial Body". He took it out and looked back and saw that it was indeed published in 1938. The publication date just matched the number recorded in the notebook.

Finding two books in a row made Yang Jing even more excited. For most of the next day, he searched almost all the books on the bookshelf in this study. As a result, he found more than 30 books recorded in these bookshelfs, and the publication dates corresponded to the numbers written in the notebook.

These books are unique in this study and have not been published in other years.

By this time, Yang Jing could have been very sure that the 19** number after the names of the books in his notebook is the year of publication of these books.

But what disappointed Yang Jing was a little bit disappointed that even though he found so many books that meet the conditions in the study, he was still a small piece away from the more than 50 books recorded in his notebook.

Obviously, some of the books recorded in the notebook were either those Alfred saw and recorded from other places, or those books were cleaned up by servants after Alfred died.

But that doesn't matter. There is also a guy here who grew up from Alfred since he was a child.

After asking the housekeeper of Shayton, Shayton tried hard to recall: "Sir, after Mr. DuPont passed away, I remember that some of the books were indeed taken away by Madame Vanessa, but I really can't remember those books."

Yang Jing knew that Vanessa was Alfred's wife, and there were large photos of them in this manor.

When her husband died, she naturally wanted to take away some important relics. It is estimated that Alfred liked to read those books during his lifetime, but Madame Vanessa took away as important relics.

"Alex, I want to ask you to do something in the past two days." After thinking about it, Yang Jing knew that the books that were pulled away should not be found, but these books are not rare ancient books. They are all books with a large circulation. Although the release date was mostly forty or fifty years ago, there should still be a lot of them. Therefore, even if there are no books, these books can be found in the market or library, so Yang Jing was planning to ask Shayton to buy these books back for himself.

"Sir, you are so kind. If you have any questions, just give me instructions."

"Well, it's not really a difficult thing. I have a list here. Can you please buy these books for me?"

As he said that, Yang Jing pulled a piece of paper and based on his memory, he wrote down the titles of the books that were not found in the study. Of course, the focus was on the year of publication.

"Alex, I need some of these books to check for things, but there isn't here." Yang Jing pointed to the messy books on the bookshelf. That was his "credit" for most of the day. "These are the names of the books I wrote. I want you to buy them for me. But please be careful, you must buy them according to the year of publication I wrote. If it was not published that year, don't buy them."

Butler Shayton's eyes fell on the slightly messy bookshelf, frowned slightly, but then smiled and took the list and looked at it, saying, "Sir, most of the books you need were published in the 1930s and 1940s. This kind of book should not be easy to buy on the market now. I need to arrange for people to go to libraries in major cities to find these books. These books that have been old have only extra collections in those large libraries."

Yang Jing nodded and said, "As long as there is a way to buy these books, I don't care what it costs. Alex, I'll trouble you about this."

"Don't worry, sir, I will handle this for you. Well, if it goes well, you will see these books tomorrow night. Of course, because most of these books are books with a relatively long publication date. If it doesn't go well, you may not see these books a little later."

Yang Jing smiled and said, "It doesn't matter if you're two days late, but you must buy these books for me."

Butler Sethton nodded and said, "Sir, an hour and a half later, the restaurant has prepared dinner for you. Today is Mexican food, which is the hometown dish of our chef Mr. Carlos, and you will probably like it."

Seeing Yang Jing nodding in agreement, Butler Shayton nodded slightly and left the study room.
Chapter completed!