An account of the life of Theodor Hielscher, a naturalist, born on December 16, 1822, at Nimptsch near Breslau, Silesia, and died at Eagle Pass, Texas, on April 11, 1907.
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Geiser, S. W.
"Theodor Hielscher, Early Texan Naturalist,"
Field and Laboratory: Vol. 24
Available at: https://scholar.smu.edu/fieldandlab/vol24/iss2/3