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  1. By: Cockerell, Theodore D. A. (Theodore Dru Alison),
    Publication info: New York City, The American Museum of Natural History, [1938]
    Holding Institution: American Museum of Natural History Library
    Subjects: Bees  Bumblebees  Classification  Halictus  Hylaeus ellipticus  Insects  Prince Albert National Park  Saskatchewan
  2. By: Cockerell, Theodore D. A. (Theodore Dru Alison),
    Publication info: New York City, The American Museum of Natural History, [1937]
    Holding Institution: American Museum of Natural History Library
    Subjects: Bees  Ceratina (Ceratinidia) incertula  Classification  Halictus  Insects  Thailand
  3. By: Cockerell, Theodore D. A. (Theodore Dru Alison),
    Publication info: New York City, The American Museum of Natural History, [1938]
    Holding Institution: American Museum of Natural History Library
    Subjects: Bees  Classification  Halictus  Insects  Morocco
  4. By: Cockerell, Theodore D. A. (Theodore Dru Alison),
    Publication info: New York City, The American Museum of Natural History, [1937]
    Holding Institution: American Museum of Natural History Library
    Subjects: Angara River Valley  Bees  Classification  Halictus  Hylaeus  Insects  Russia (Federation)  Siberia  Siberia, Eastern  Sphecodes
  5. By: Cockerell, Theodore D. A. (Theodore Dru Alison), - Cockerell-Mackie Expedition
    Publication info: New York City, The American Museum of Natural History, [1937]
    Holding Institution: American Museum of Natural History Library
    Subjects: Bees  Classification  Halictus  Insects  Morocco
  6. By: Nye, William P.
    Publication info: Oakland, Calif, Agricultural Research (Western Region), Science and Education Administration, U.S. Dept. of Agriculture, [1980]
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
    Subjects: Bees  Halictidae  Halictus