A mineral and locality database. I use this site to find basic info on mine sites that I might be interested in visiting. Listings usually provide lat/long co-ordinates.
Images of the paperwork that is on file for Arizona mines at the Arizona Geological Survey.
A USGS site that I use to download topo maps
Website that provides copies of many historical Arizona topographic maps
A site that specializes in listings of places to hike in Arizona
Site that provides descriptions of hikes to Arizona highpoints.
A site with comprehensive listings for streamflows in Arizona
This is a site for kayakers and canoers. The message boards are informative.
Another forum type site for rafting and kayaking folks.
A couple of websites that highlight places to explore in Nevada and California.
Facebook groups/pages that I will look in on:
Ancient Exploring in Arizona.
Beata Certo: A site with many photos of old town and buildings in New Mexico.