Baseline topos for U.S., plus additional layers; create and share your own maps.

Maps of watersheds and their environmental assessment, Superfund sites, and facilities monitored by the EPA.

Bureau of Land Management maps, including Public Land Survey System.

The Public Land Survey System (PLSS) is a way of subdividing and describing land in the United States. All lands in the public domain are subject to subdivision by this rectangular system of surveys, which is regulated by the U.S. Department of the Interior, Bureau of Land Management (BLM).

California Geological Survey, Geologic Data Map No. 6

from the National Cooperative Soil Survey

Searchable USGS topo maps. See how an area has changed over time. Example is for Cotati Quadrangle.

Print topo maps for the North Bay region.

North Bay regional maps, including earthquake, flood, and other hazard maps.

Extensive collection of historic Sonoma County maps.

Search for specific cities or towns, e.g., Petaluma, Sonoma, etc.

Amazing collection of current and historical maps --from ebola outbreaks to early view of all the continents.

Searchable USGS topo maps. See how an area has changed over time. Example is for Cotati Quadrangle.

Lots more sites with historical maps

U Michigan's Clark Library Map Collection

Topographic map symbols are explained in the links on the left side.

Call Number: Regional Atlas Case GB400.5 .E2 1999

Call Number: GA105.3 .M83 1998

Call Number: Regional UG470.S765