Links: Headwaters of the Susan River and Lassen Volcanic National Park

Geologic Map of Lassen Volcanic National Park and Vicinity, California:
main page at USGS

Geologic Map of Lassen Volcanic National Park and Vicinity, California:
Sheet 1, geologic map

Geologic Map of Lassen Volcanic National Park and Vicinity, California:
Sheet 2, correlation chart

Geologic Map of Lassen Volcanic National Park and Vicinity, California:
Sheet 3, figures

Geologic Map of Lassen Volcanic National Park and Vicinity, California:
pamphlet (write up of the geology)

Susan River (Wikipedia)

Susan River Area Rapid Watershed Assessment (USDA NRCS)

Bizz Johnson Trail and Susan River (BLM)

Bizz Johnson Trail and Susan River (Friends of the River)

Great Basin (NPS)

Great Basin (Wikipedia)

Ishi, Thousand Lakes & Caribou Wilderness (order the wilderness map)