Geographical Location - California
- Offshore Oil Well Blows near Santa Barbara, California
- An Offshore Oil Well Blows Out Near Santa Barbara, California
- Operation Wetback
- Oppenheimer Calculates the Nature of Black Holes
- Ornaments
- Owens Valley Farmers Blow Up the Los Angeles Aqueduct
- Paiute, Northern
- Patayan
- Patwin
- Pauling Develops His Theory of the Chemical Bond
- Petroglyphs
- Plan to Save California Redwoods Is Approved
- Pomo
- Prehistory: California
- Prehistory: Great Basin
- Prehistory: Northwest Coast
- Price Club Introduces the Warehouse Club Concept
- Quarks Are Postulated by Gell-Mann and Zweig
- Quechan
- Radar-Invisible Stealth Aircraft Are Introduced
- Researchers Generate Nuclear Energy on Tabletop
- Richter Develops a Scale for Measuring Earthquake Strength
- Rise of the California Missions
- Roosevelt and Muir Visit Yosemite
- Rowland and Molina Theorize That Ozone Depletion Is Caused by Freon
- Rutan and Yeager Pilot the Voyager Around the World Without Refueling
- The Sagebrush Rebellion Begins
- Salinan
- The San Diego Trolley Opens
- Schmidt Makes What Constitutes the First Recognition of a Quasar
- Scientists Find Strong Evidence for “Big Bang”
- Scientists Warn That CFCs Are Destroying the Ozone Layer
- Seaborg and McMillan Make Element 94, Plutonium
- The Sealab 2 Expedition Concludes
- Serrano
- Settlement of Alta California
- Shapley Proves the Sun Is Distant from the Center of Our Galaxy
- Shasta
- Shoshone
- Sierra Club Blocks Dams on the Colorado River
- Smith Explores the Far West
- Solar One, the Prototype Power Tower, Begins Operation
- Sperry Discovers That Each Side of the Brain Can Function Independently
- The Spotted Owl Prompts Old-Growth Timber Controversy
- The Supreme Court Rules that Laws Can Force Groups to Admit Women
- Symbionese Liberation Army Kidnaps Patty Hearst
- Tlingit
- Tolowa
- Tubatulabal
- Two New Elements Are Added to Periodic Table
