Georeferenced pdfs

These pdfs can be downloaded and viewed using an app on your phone that can display georeferenced pdfs. The most popular app has been Avenza Maps, but it now requires a paid subscription to allow importing maps. A good map for iPhone is Topo Reader: after you have installed the app, download the maps below and save them on your phone, then share them with Topo Reader. 

Please let us know if you find a good free Android app!