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Correspondence from A.A. Humphreys to John Torrey, dated 1855, discussing practical issues related to the production of the first two volumes of the Pacific Railroad Survey reports, particularly accounting and the engraving of plates. The collection includes a letter from Humphreys to Captain John Pope, author of one of the reports.
Correspondence from John Torrey to Asa Gray, dated undated. Three small slips covered in notes on various species of Vaccinium.