General Resources.
Google Maps. I try, if at all possible, to visit the locations in my stories, but sometimes 1. it’s not feasible and/or 2. I need a refresher. Google Maps and Google Earth are the next best thing to actually being there.
West Point directory
The research for An Uncivilized Yankee was done in the days before the Internet was fully ripened, therefore, I can’t think of a single online site I used for that book.
A Great Wide Nowhere.