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  1. By: Gregg, Robert Edmond,
    Publication info: New York, American Museum of Natural History, [1952]
    Holding Institution: American Museum of Natural History Library
    Subjects: 59.57,96P(78.8)  Ants  Baca County  Classification  Colorado  Insects  Pheidole senex  
  2. By: Gregg, Robert Edmond, - Creighton, William Steel, - Creighton, William Steel, Mrs.
    Publication info: New York, American Museum of Natural History, [1953]
    Holding Institution: American Museum of Natural History Library
    Subjects: 59.57,96P(78.8)  Ants  Anza-Borrego Desert State Park  California  Classification  Insects  Pheidole (Ceratopheidole) clydei