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  1. By: United States. Department of Agriculture. - Tracy, S. M. (Samuel Mills), - Nealley, George C. - Pool, J. - Vasey, George,
    Publication info: Washington, Govt. Print. Off, 1888
    Holding Institution: Missouri Botanical Garden, Peter H. Raven Library
    BHL Collections: Engelmann Herbarium
  2. By: Tracy, S. M. (Samuel Mills), - Nealley, G. C. (George C.) - Pool, J. - Vasey, George,
    Publication info: Washington, Govt. Print. Off, 1888
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library