Everything you ever wanted to know about signing trails in the National Forest:
- United States Forest Service’s very comprehensive Sign and Poster Guidelines for the Forest Service
- A listing of all the above Guideline sections in PDF format
- Signage section from the USFS Trail Construction and Maintenance Notebook
- USFS Signposts for Snow Trails
- Forest Service Installation Guide
- IMBA Trail Difficulty Ratings and Signs
- Carsonite brand signage
- US Forest Service National Trail Drawings and Specifications with specific sign and post installation
Also check out the American Trails Resources and Library and Three Elements of Sustainable Trails.