Digital engineering aspects karst map: a GIS version of Davies, W.E.; Simpson, J.H.; Ohlmacher, G.C.; Kirk, W.S.; and Newton, E.G., 1984, Engineering Aspects of Karst: U.S. Geological Survey, National Atlas of the United States, scale 1:7,500,000We print high quality reproductions of historical maps, photographs, prints, etc. Because of their historical nature, some of these images may show signs of wear and tear - small rips, stains, creases, etc. We believe that in many cases this contributes to the historical character of the item.