A poster for rockets and space reference
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http://i.imgur.com/nA4Z894.jpg
Nasa history page
the NASA History Series page
Humans traveled into space in 1961. The Saturn V first flew in 1967. That's a massive amount of "cutting edge" progress in 6 years. To understand how advanced the Saturn V was for the 1960's, read NASA SP-4206: Stages To Saturn - A Technological History of the Apollo/Saturn Launch Vehicles.
Note:
- SP-2005-4110, which is an english translation of Boris Chertok's Rockets and People, a history of the Soviet space program
- SP-4303, On the Frontier: Flight Research at Dryden, 1946-1981
- SP-4203, On Shoulders of Titans: A History of Project Gemini
- SP-4220, Wingless Flight: The Lifting Body Story
- SP-4232, Facing the Heat Barrier: A History of Hypersonics