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I love the fact that NASA gives away most of their stuff. They've made their 204-page book "Space Settlements - A Design Study" from 1976 available for free download.
https://ntrs.nasa.gov/citations/19770014162
The actual link to the ebook:
https://ntrs.nasa.gov/.../downloads/19770014162_update.pdf
(Rename it after you download it.)
For those who, like myself, detest pdf format, the whole thing is available as webpages too:
https://space.nss.org/settlement/nasa/75SummerStudy/s.s.doc.html
It was the result of a 10-week program in engineering systems design held at Stanford University and the Ames Research Center of NASA during the summer of 1975. Among the many people involved was Gerard O'Neill -- a name many space enthusiasts will recognise.

https://ntrs.nasa.gov/citations/19770014162
The actual link to the ebook:
https://ntrs.nasa.gov/.../downloads/19770014162_update.pdf
(Rename it after you download it.)
For those who, like myself, detest pdf format, the whole thing is available as webpages too:
https://space.nss.org/settlement/nasa/75SummerStudy/s.s.doc.html
It was the result of a 10-week program in engineering systems design held at Stanford University and the Ames Research Center of NASA during the summer of 1975. Among the many people involved was Gerard O'Neill -- a name many space enthusiasts will recognise.
