California Surveyors Forums

I'm looking to get calibration information for an aerial survey done by the USFS in 1942. Can anyone point me in the right direction for who to contact? I realize this is a long shot, but still need to try.

Thanks!
Dan

I take it you might have found this already via google, but if not, it may be a good starting point:
https://www.archives.gov/research/guide ... s/095.html