I came to the reference room on the second floor of the central workshop to talk with konstanz and promised to help her find three books to lend. As long as you search the design room on the third floor, the infirmary and the laboratory on the fourth floor respectively, you can collect them all and complete the task.

After the side task 1 was completed, I didn't expect konstanz to say that the official task had just begun. I think it's more than just collecting books. The task is to retrieve a book called Albert Woodpecker Ecology. In the past, a strange borrower hid the book. As long as you go to the Hongye Pavilion in Yarmo Village, you can find it in the stone lanterns beside the corridors and pools. When you return to konstanz, the task is completed.

The book is hidden near Torrant Plain Road, where you will also meet Warcraft and four golden rhinos. After destroying them, you can complete the sideline task of destroying Warcraft.

According to the prompt, I finally found the book "The Adventures of Haitz Teenagers" in the four pillars. Next, you can get the clue of the last book by taking it back.

The last book named "3 1 cypress" was hidden in a bucket on the third floor of the "St. Heim Gate" checkpoint leading to Wang Du. After getting the book, you will be rewarded by the bibliophile for uncovering a series of puzzles, and the crystallization circuit will "hinder 3". Returning the book, the series of tasks were finally completed.