| Frederick Gutekunst Cundurango De Tumbo Grande 1873 (ca) Albumen print 24.3 x 18.3 cm George Eastman Museum Record Id: 1999:0111:0006 LL/35652 William S.W, Rushenberger, M.D. A Report on the Origin and Therapeutic Properties of Cundurango. (Washington: Government Printing Office, 1873.
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