- Anything Musical (real or fanciful), including
- musical instruments of any type
- musical instrument manufacturers
C. G.
Conn Musical Instrument Company, Elkhart, Indiana (any cards published by Conn)
- bands, orchestras, ensembles of any type or size
performers, people making music (all cultures)
- bandstands, bandshells
- amphitheaters
- auditoriums, municipal auditoriums, music halls, concert halls, opera houses (both interiors and exteriors)
- church interiors showing organs
- musical notation
- composers
pre-1930 holiday cards with music or musical instruments
- Anything having to do with City Parks, including
- park scenes
- park benches
- park fountains
- boating on park lakes
- bandstands, bandshells, dance and picnic pavillions
- people in parks
- The following specific Places (from any time period):
- Berlin, Germany
- Catalina Island, California
Corn
Palace, Mitchell, South Dakota
- Elkhart, Indiana
- Hamilton, New York
- Saratoga Springs, New York
- Sioux City, Iowa
- Sioux Falls, South Dakota
- South Dakota (any towns)
Vermillion, South Dakota
- Other categories:
- Bears (esp. bears around people and cars in national parks)
- Teddy bears
- Birds on pre-1930 holiday cards
- Calendar cards (pre-1930)
- Christmas cards (pre-1930)
- Churches
- Eagles
- Easter cards (pre-1930)
- Halloween cards (pre-1930)
- Holiday and Greeting cards, pre-1930 (all types)
- Homes of famous people
- Large letter cards
- Leap Year cards (pre-1930)
- Maps
- Memorial Day cards (pre-1930)
- New Year's cards (pre-1930)
- Micki and Mecki (German)
- Military humor
- Patriotic
- People doing things (pre-1960, all cultures)
- Redwood Forest
- St. Patrick's Day cards (pre-1930)
- State capitols
- Thanksgiving cards (pre-1930)
- Tuck cards
- U.S. Navy Ships
- Valentine's Day cards (pre-1930)
- Victorian architecture