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  1. By: Godman, Frederick Du Cane, - Salvin, Osbert, - Porter, R. H.
    Publication info: [London, R.H. Porter], 1879-1904
    Holding Institution: Cornell University Library
  2. By: Porter, R. H. - United States. Office of Mycology and Disease Survey.
    Publication info: [Washington, D.C.], Office of Mycology and Disease Survey, Bureau of Plant Industry, United States Department of Agriculture, 1926
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  1. By: Porter, R. H.
    Type: Correspondence
    In: Asa Gray correspondence
    Date: 1883-11-29
    Publication Info: [1844-1892]