Contributions to the botany of the Yukon Territory 1901]
From the Bulletin of the New York Botanical Garden, v. 2, no. 6 1. An enumeration of the Hepaticae collected by R.S. Williams, 1898-1899, by Marshall A. Howe.--2. An enumeration of the mosses collected by R.S. Williams.--3. An enumeration of the Pteridophytes collected by R.S. Williams and J.B. Tarleton, by L.M. Underwood.--4. An enumeration of the flowering plants collected by R.S. Williams and J.B. Tarleton, by N.L. Britton and P.A. Rydberg
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