lotsa you might try looking for historical aerial photographs (not satellite imagery but from plane flights). Most of US was photographed in 40's and 60's. Possible sources are Soil Conservation Service, Forest Service, or there are some historical aerial photo companies that have very large libraries (used by environmental firms for Phase I and II site assessments). You might also try the geography department (remote sensing group) of local or nearby universities and see if they have an aerial photo library or who they might reccommend for aerial photos of that area. Good luck hope you find it.