This is for the 1982 USGS Saturated Thickness of the High Plains Regional Aquifer in 1980, Northwest Oklahoma Open File Report 82-760. Map is great and the outside Folder shows crease and tears. Could be a crease in the map I did not see.
This was published in 1960 and was Oil and gas investigations Chart OC 61 by the United States Geological Survey. This is from a non-smoking and pet free household.