Black Hills Forest, South Dakota 



19 stereograms, aerial photo scale variable 1:20,000. 



Arrangements to obtain 5x7 photo prints from the original negatives 

 can be made through the Director, Intermountain Forest and Range Experiment 

 Station, Ogden, Utah 



Figure 1. Combined aerial and ground stereograms illustrating ponderosa 

 pine in Idaho and Black Hills areas (next page) . 



2 



