Here's a nifty collection of searches that I myself use when trolling for lamps. They should provide the maximum number of relevant lamps with minimum junk!

Lamp Manufacturers/Designers:
Claes
Econolite motion lamps
L.A. Goodman motion lamps
Haeger Potteries and/or Royal Hickman (includes all Haeger lamps)
Helmscene Illuminated Pictures
Hollywood Ceramics (includes all Hollywood Ceramics products)
Kron/Texans Incorporated
Lane & Company
Maddux of California
Phil-Mar
Rosemeade

Lamp Styles:
Cats
Dogs
Ducks
Horses
Panthers and other Big Cats

Other Searches:
California pottery
Chalkware TV lamps
'50s lamps