maps
general
Maps and related items for sale.Maps, guidebooks, and other general interest items for all regions of the State of California.California Geological Survey
U.S. Geological SurveyFind a local vendor for topographic maps covering your area of interest.
computing tools
general
NIH Image"NIH Image is a public domain image processing and analysis program for the Macintosh. It was developed at the Research Services Branch (RSB) of the National Institute of Mental Health (NIMH), part of the National Institutes of Health (NIH).