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archive.org
Warming, E., 1884. Haandbog i den systematiske botanik. Anden gjennemsete udgave. 2nd ed. Kjøbenhavn, 434 pp. German translation (1890) of the 2nd Danish edition available at archive.org: [1]. English translation (1895) of the 3rd Danish edition (1892) available at archive.org: [2].
