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  1. By: Schaeffer, Bobb, - Cope, E. D. (Edward Drinker), - Hill, Robert Thomas,
    Publication info: New York, N.Y American Museum of Natural History [1960]
    Holding Institution: American Museum of Natural History Library
  2. By: Cope, E. D. (Edward Drinker), - Hill, Robert Thomas, - Schaeffer, Bobb,
    Publication info: 1960
    Holding Institution: American Museum of Natural History Library
  3. By: Hill, Robert Thomas,
    Publication info: New York, Century, 1898
    Holding Institution: New York Botanical Garden, LuEsther T. Mertz Library
  4. By: Hill, Robert Thomas, - Hovey, Edmund Otis,
    Publication info: 1907
    Holding Institution: American Museum of Natural History Library
  5. By: Allen, J. A. (Joel Asaph), - Anderson, Malcolm P. - Andrew J. Stone Expedition 1903) - Hill, Robert Thomas, - Stone, A. J. (Andrew Jackson),‏ ‎
    Publication info: 1904
    Holding Institution: American Museum of Natural History Library
  6. By: Hill, Robert Thomas,
    Publication info: Washington, D.C, Dept. of Agriculture, Forestry Division, 1899
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  7. By: Hill, Robert Thomas,
    Publication info: Los Angeles, Calif, Southern California academy of Sciences, 1928
    Holding Institution: Prelinger Library