American Orchid Society - USA
Sonoma County Orchid Society - Santa Rosa, CA
Sacramento Valley Orchid Society - Sacramento, CA
Cymbidium Society of America - Cymbidiums & Paphiopedilums
Napa Valley Orchid Society - Napa, CA
Golden Gate Cymbidium Society - Oakland, CA
Marin Orchid Society - San Rafael, CA
San Francisco Orchid Society - San Francisco, CA
Royal Horticultural Society (England) - The World Orchid Registrar
American Orchid Society - Orchid Show Listings