The most Expensive Physics Book in the world

Who was Paul Dirac? 
Expensive Physics text book in the world?
Who was the author of this Physics book ? 
In which year the book was published?
In how much US-Dollars the first copy was sold?
In how many days the book was completed?
Total units in this book?
Principles of Quantum Mechanics?

                 

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The most expensive physics textbook in the world was the first edition of "The Principles of Quantum Mechanics" by Paul Dirac, published in 1930. 
This book is considered a seminal work in the field of quantum mechanics and helped establish the framework for modern physics. Copies of the first edition of this book are extremely rare and highly sought after by collectors:

In 2018, a copy sold at auction for $103,500, making it the most expensive physics textbook ever sold.

Total units :

"The Principles of Quantum Mechanics" by Paul Dirac has a total of 26 chapters.

Total duration for completion:
It is not clear how long it took Paul Dirac to complete "The Principles of Quantum Mechanics" as he worked on it over a period of several years. Dirac began working on the book in the late 1920s, and the first edition was published in 1930. 

During this time, he was also working on his 

own research in the field of quantum mechanics and teaching at the University of Cambridge.  

So, it is likely that the writing and completion of the book took place over a longer period of time, rather than being completed within a specific number of days or weeks.

Who was Paul Dirac:
Paul Dirac was a British physicist who was born in Bristol, England on August 8, 1902. He spent most of his academic and professional career in the United Kingdom, including studying at the University of Cambridge and later serving as a professor at the same institution. He made significant contributions to the field of quantum mechanics and was awarded the Nobel Prize in Physics in 1933 for his work on the "discovery 

of new productive forms of atomic theory." Dirac passed away on October 20, 1984, in Tallahassee Florida, USA.