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NASA's free history e-book collection https://history.nasa.gov/books_sort_SP.html
@estherschindler This reminded me that science-fiction novelist Alfred Bester wrote a good NASA history book: The life and death of a satellite. It's worth looking up if you're a Bester complest (Guilty) or interested in early satellite history.
@estherschindler I have several of these in hardbound from my days at Goddard Space Flight Center. Neat books.