Correspondence (letters to Harley Harris Bartlett and Steven White from Ivan M. Johnston) -- Plants of Nuevo Leon, Coahuila, Chihuahua and Sonora collected in 1939 -- Mexican plants collected by White in 1939, first supplementary report -- Incomplete data on collection of Mexican plants made by Steven White in 1939 [collecting locality list]

Plant lists, list of collecting localities plus three letters. Plant determinations were made by Ivan M. Johnston

Field notes and plant identification records, 1850-1990, of the Gray Herbarium, Arnold Arboretum, and Farlow Herbarium Archives, Harvard University Herbaria

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