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http://www.nhahistoricalsociety.org/index.php/hh-3f-sikorsky-s-61r-pelican-helicopter/
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https://en.wikipedia.org/wiki/Semi-Automatic_Ground_Environment
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https://www.ll.mit.edu/about/history/sage-semi-automatic-ground-environment-air-defense-system
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http://www.extremetech.com/computing/151980-inside-ibms-67-billion-sage-the-largest-computer-ever-built
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https://history-computer.com/ModernComputer/Electronic/SAGE.html
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http://ds-wordpress.haverford.edu/bitbybit/bit-by-bit-contents/chapter-seven/7-3-sage-semi-automatic-ground-environment-computers/
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https://fas.org/nuke/guide/usa/airdef/sage.htm
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https://www.ibm.com/ibm/history/ibm100/us/en/icons/sage/
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https://en.wikipedia.org/wiki/Z1_(computer)
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http://zuse-z1.zib.de/
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