Image: USGS 1950s mapping field camp
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Description: 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.)
Title: USGS 1950s mapping field camp
Credit: USGS Historical Photographs: Mapping Field Camp: http://online.wr.usgs.gov/outreach/historicPhotos/enlarged/mapping_camp_1950.html
Author: US Geological Survey
Usage Terms: Public domain
License: Public domain
Attribution Required?: No
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