tncaver wrote:I want the old Libre Map Project back. It was awesome. It listed almost every state and each state listed ALL the maps
in alphabetical order. They were downloadable in TIFF format or could be opened online.
I do not see the point of the Libre Map project. The USGS has ALL the US topo maps as downloadable PDFs. I do mean ALL! I have downloaded 30-minute quads from 1890 and the latest remapping from 2015, all for the same area.There might be three versions of the 1968 map: the original and two revisions with purple overprinting to show changes. The USGS user interface can be confusing because there are multiple ways to get to a particular map. A good place to start is
http://nationalmap.gov/ustopo/index.html .
The 1960's and earlier maps are simply scans of paper maps. The current maps have features that can be turned on and off in the PDF viewer. They are based on orthophotos with overlaid features. You can turn off the contours to make the photo clearer or you can turn off the photo to make the contours clearer. You can turn off features until you have a blank sheet of paper.
The current maps are missing features that were in the earlier maps. Buildings are not represented by symbols because they are in the photo. The maps are missing railroads, county lines, and spot elevations.