If we are sharing favorite RAND books, this introduction to game theory from 1954 is lovely (I read it twice): https://www.rand.org/pubs/commercial_books/CB113-1.html I admit I skipped over much of the maths, since a lot of it is about clever tricks to manually do operations on matrices (might be fun to read about, but probably not very useful these days?).
And also this book from 1947 with ONE MILLION random digits: https://www.rand.org/pubs/monograph_reports/MR1418.html The foreword from 2001 goes into a lot of detail how and why the numbers were made (which is, I guess, more interesting than to download the book itself?).
These tables were reproduced by photo-offset from pages printed by the IBM model 856 Cardatype. Because of the very nature of the tables, it did not seem necessary to proofread every page of the final manuscript in order to catch random errors of the Cardatype.
And also this book from 1947 with ONE MILLION random digits: https://www.rand.org/pubs/monograph_reports/MR1418.html The foreword from 2001 goes into a lot of detail how and why the numbers were made (which is, I guess, more interesting than to download the book itself?).