Reconnaissance erosion survey of the State of Indiana
Georeferenced: false
Description:
At bottom left: Base map by U.S. Geological Survey, 1930. Scale 1:500,000 U.S. Department of Agriculture, Soil Conservation Service; Indiana erosion survey of 1934 by M.E. Waggoner, in charge, A.E. Shearin, T.M. Bushnell, D.C. Maxwell, E.E. Carlson.