National Speleological Society
Recommended Caving Gear (Mother Lode Grotto)
Area Geology
William (Bill) Hirt – Cascade/Klamath Area
USGS Field Trip Guides
Medicine Lake Geologic Map
USFS Pubs
Surveying
About: https://www.derekbristol.com/survey-overview
NSS Pub: A Guide to Cave Mapping