Data Type (click for a complete description)

Link or other availability

Topographic maps (1:24,000)  NRIS Topofinder  
Digital orthophotos (air photos)  NRIS Topofinder  
Digital elevation models  NRIS download site

Geologic map of Butte 1:250,000 quadrangle 

Geologic map of Montana

MBMG download site

Geologic Map of Montana

Printed References - Geology   MBMG Publications database
Printed References - Floodplain Contamination and Geomorphology 

key to acronyms