Lassen county California

[Alloffroad]

I live in lassen county California and want to find old camps to detect. Not just mining camps but logging and immigrant camps too. What is a good resource for maps of this nature? Or is there some other way to find these camp locations? Other counties nearby are plumas, sierra, modoc.

 

[USCGD]

The local library should have books on local history. Historical Society would also be a good resource.
Use Topoviewer to find USGS topographical maps.
Use Historic Aerials to see old birds-eye photos.