Genealogy:
California Pioneer Project
Census Resources for Genealogy
Genealogical and Historical Societies
Genealogy.org
Hispanic Historical and Ancestral Research
LDS Genealogy
Los Pobladores, Los Angeles' Founding Families
Riverside and S.B. County Genealogical Soc.
RootsWeb
San Bernardino County (Kindred Trails)
San Bernardino County (USGen Web)
SoCal Genealogy Societies

Native Americans:
American Indians in California
Curtis Collection
Edward S. Curtis's The North American Indian
Native American Resources in Southern Calif.
San Manuel Band of Mission Indians
Serrano Indian Tribe History

Preservation:
California Citrus State Historical Park - Riv.
California Landmarks - San Bernardino County
California Office of Historic Preservation
California Preservation Foundation
City of San Bernardino - Mills Act
National Register of Historic Places
State Historical Landmarks

Societies:
California Historical Society
Chinese Historical Society-Southern California
Colton Historical Society
Highland Area Historical Society
Historical Society of Southern California
Jedediah Smith Society
Jewish Historical Society-Southern California
Loma Linda Historical Commission
Mohahve Historical Society - Victorville
National Japanese American Historical Soc.
Native Sons of the Golden West - S.B.
Pacific Railroad Society
Perris Valley Historical Association
Redlands Area Historical Society
Rialto Historical Society
Riverside Historical Society
San Bernardino Historical and Pioneer Society
San Bernardino Railroad Historical Society
San Gorgonio Pass Historical Society
The Sante Fe Railway Historical & Modeling Society
Yucaipa Valley Historical Society

Libraries:
Oakland Public Library
A.K. Smiley Public Library, Archives - Redlands
Bancroft Library - University of California Berkeley
Colton Hepburn Library
Huntington Library - San Marino
John M Pfau Library - CSUSB
Library of Congress
Loma Linda Branch Library
Loma Linda University Libraries
National Archives Pacific Region - Laguna Niguel
National Archives - Washington D.C.
San Bernardino Public Library - California Room
San Bernardino Valley College Library
Sherman Library - Corona del Mar
UCLA Libraries
USC Libraries
UCR Libraries - Riverside
University of Redlands Library
U.S. Geological Survey Photographic Library

Maps:
David Rumsey Historical Map Collection
Harvard University Map Collection
Historical Map Websites - Perry Casteneda
Library of Congress - Maps
Map Collections (Early Maps)
Sanborn and Other Fire Insurance Maps
Truckers Report
University of Colorado

Trails:
Anza National Historic Trail
California Trail
Mojave Trail
Mormon Pioneer Trail
Old Spanish Trail
Salt Lake Cutoff Trail
Santa Fe Trail

Museums:
Agua Caliente Cultural Museum - Palm Springs
Autry National Center - Los Angeles
California Missions
California State Military Museum - Sacramento
California State Railroad Museum - Sacramento
Colton Museum
Fred Harvey Museum - Leavenworth, KS
Gilman Ranch & Wagon Museum - Banning
Historical Glass Museum - Redlands
Historical Museums of California
Lincoln Memorial Shrine - Redlands
Malki Museum - Banning
March Field Air Museum - Riverside
McDonald's Museum - San Bernardino
Mission Inn Museum - Riverside
Norton AFB Museum
Orange Empire Railway Museum - Perris
Pacific Railroad Museum - San Dimas
Pasadena Museum of History
Perris Valley Museum
Redlands Historical Museum
Robert V. Fullerton Art Museum - CSUSB
San Bernardino County Museum - Redlands
San Bernardino History & Railroad Museum
San Diego Model Railroad Museum
Sherman Indian Museum - Riverside
Smithsonian
Southern California Medical Museum - Riverside
UCR/Calif. Museum of Photography - Riverside
Western American Railroad Museum (W.A.R.M) - Barstow
Western Science Center - Hemet