Following up on the History of the Thor rocket, I have the History of the Delta rocket, which began as a NASA version of the Thor in 1960. The Delta would evolve over time to match the mission requirements as they grew. Japan would build their own version of the Delta too for their launch program.
This covers the first 20 years of Delta design evolution, up to 1981 and the arrival of the Space Shuttle which was supposed to replace it.
Again, heavily influenced by Ed Kyle’s History:
https://web.archive.org/web/20220406013820/http://www.spacelaunchreport.com/thorh.html
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