Carl Zerrahn (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Carl Zerrahn" in English language version.

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archive.org

Gilman, D. C.; Peck, H. T.; Colby, F. M., eds. (1905). "Zerrahn, Carl" . New International Encyclopedia (1st ed.). New York: Dodd, Mead.
Rines, George Edwin, ed. (1920). "Zerrahn, Carl" . Encyclopedia Americana.
Reynolds, Francis J., ed. (1921). "Zerrahn, Carl" . Collier's New Encyclopedia. New York: P. F. Collier & Son Company.