Sort By:
  1. The birds of El Paso County, Colorado /
    By: Aiken, Charles Edward Howard, - Colorado College.
    Publication info: Colorado Springs :Published by the authority of the Board of Trustees of Colorado College,1914
    Contributed by: Cornell University Library
    Subjects: Birds  Colorado  El Paso County  
    View Book
  2. Twisted crystals of pyrite and smoky quartz. American Museum novitates ; no. 829
    By: Frondel, Clifford, 1907-
    Publication info: New York City : The American Museum of Natural History 1936
    Contributed by: American Museum of Natural History Library
    Subjects: Chester County  Colorado  Crystal growth  Crystallography  Dislocations in crystals  El Paso County  Minerals  Pennsylvania  Pyrites  Quartz  
    View Book (External)
  3. Two nocturnal bees and a minute Perdita. American Museum novitates ; no. 66
    By: Cockerell, Theodore D. A. (Theodore Dru Alison), 1866-1948.
    Publication info: New York City : By order of the Trustees of The American Museum of Natural History 1923
    Contributed by: American Museum of Natural History Library
    Subjects: Arizona  Bees  Caribbean Area  El Paso County  Insects  Megalopta (Megaloptella) vigilans  Perdita minima  Tempe Region  Texas  Xerophasma bequaerti  
    View Book (External)