FACTORS IN THE FREQUENCY AND TYPES OF CANCER IN MAMMALS AND BIRDS AT THE PHILADELPHIA ZOO*

Authors

  • R. L. Snyder,

    1. Penrose Research Laboratory, Zoological Society of Philadelphia and the Department of Pathology, University of Pennsylvania, Philadelphia, Pa.
    Search for more papers by this author
  • H. L. Ratcliffe

    1. Penrose Research Laboratory, Zoological Society of Philadelphia and the Department of Pathology, University of Pennsylvania, Philadelphia, Pa.
    Search for more papers by this author

  • *

    Supported in part by grants HE-01979-09, HE-04759-04 and GM-08515-02, U.S. Public Health Service.

Ancillary