The next 3 Figures are from Cordell (1996) in Space Policy; See Articles.

The Figures show major human explorations, macro-engineering projects, and very large wars over the last 200 years relative to the 56 year Energy Cycle.
The Figures span 1800-1870, 1870-1940, and 1940-2010, respectively.

Click: 18004.pdf:

Click: 19001.pdf

Click: 19691.pdf

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