File:USGS 1950s mapping field camp.jpg

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	20:50, 30 January 2009		2,672 × 1,661 (3.5 MB)	commons>Awickert	{{Information \|Description={{en\|1=A typical USGS mapping field camp. Note the helicopter parked near the trailers. Helicopters were first used by the USGS for topographic mapping in Death Valley in 1948. (Description from USGS.)}} \|Source=USGS Historical

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