This one might be easier.
http://www.natgeomaps.com/trail-maps/pdf-quadsColoradoBob.I have a bunch of topos that we use to pay 30-50 cents each for. Now they run about $10 each at a map store.Not much cheaper if ordered thru USGS in Denver. Usually one needs four quads for a given area. That is $40. I'm too cheap to pay that.
I even had some of the Flat Tops that were blue prints because they were not in distribution yet