All 136 works are in the public domain. That means the original is a search box away, at a resolution no book can print — free, with no account, from the collection that holds it.
Nothing matches that. Try a single word — a name, a year, or a medium.
Titles get rewritten by catalogues; identifiers do not. Every entry above carries the number the holding collection uses — LC‑DIG‑ppmsca‑01657, a National Archives identifier, a mission and frame. Paste that into the archive’s search box and it goes straight to the record, where the download is usually behind the words Larger image or a plain arrow.
And why none of it costs anything: a work is in the public domain either because it is old enough that copyright has expired — in the United States, published before 1930 — or because it was made by a federal employee doing their job, in which case it was never under copyright at all. That second rule is why the posters, the war photography, the patents and the space flight in this book are all free to anybody.