Quote:
Originally Posted by Anaraxes
There's also aerial photography, pretty easy to accomplish after WW II. Probably not easily-accessible databases of random places in the Western mountain ranges, but the PCs perhaps the resources to contract the work if they know in general where they're looking and just need to pin down details.
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Visible light satellite data is probably no better than the USGS quadrangles. If satellite images would be useful for finding it, aerial photos would usually be as good or better, and by 1950 there would have been a lot of them - for the USGS (which began checking their maps periodically from aerial photographs in the 1930s, though World War II probably broke out before they got to everything), for the Forest Service, for the national and state Agriculture departments, for the county tax assessor....
Multispectral data is publically available from Landsat after 1976, but at roughly 60 meters resolution you aren't going to be finding landmarks from it, so it's basically of no use for comparison against testimony of what somebody *saw*. If you're looking for a surface mineral deposit it might help.