1915 USGS Black Hills , SD Structural and Areal Geology - 2 sheets , each oversized

DAMAGED GOODS : Measures 31 x 40" each unfolded. 18 x 21.5" folded. Includes 2 sheets

Damage from storage and use weak at creases but worthy of a little repair and use again. hard to find data regarding the geology of the region , topographic information is primary to the region as well