Interesting NASA book "After LM: NASA Lunar Lander Concepts Beyond
Apollo"

Free to read on PDF at NASA Technical Reports Server

After LM: NASA Lunar Lander Concepts Beyond Apollo
[PDF Size: 445.5 MB]
Author and Affiliation: Connolly, John F. [Editor] (NASA Johnson)

https://ntrs.nasa.gov/search.jsp?R=20190031985

Jeff
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