USGS Quads - US Topo Quadrangles - 7.5-minute Quadrangle Maps mimicking 15/7.5-minute quadrangle maps created by USGS between 1947-1992.
This repository saves time/labor spent collecting/acessing the maps by providing them together for bulk download.
PNG conversions will be added to make them web platform-able; until then, PNG conversions can be viewed at Virginia USGS National Geographic Trail Maps - flickr Album