mattsavage said:

There's a seller on Ebay, Covenant_Maps, that is selling a fair amount of reproductions of old USGS topo maps from the first half of the 20th century.

Does anyone have any experience with this sellers product?  Here's an example:  

http://cgi.ebay.com/MOUNT-HOOD.....35a62b4c73

I bought a couple of them off ebay also, the '27 Mt Hood quad, and the '16 Estacada quad. Like Robert said, there just photocopies, but if you don't have anything else, they do show you some of the old trails. Here is a section of the '16 Estacada: