Oligochaeta Michaelsen, W. (Wilhelm), 1860-1937 creator text book Berlin R. Friedländer und Sohn 1900 1900
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GER Annelida Oligochaeta Worms QL391.A6 M62 1900 Tierreich, 10. Lief https://www.biodiversitylibrary.org/bibliography/11605 19050063 10.5962/bhl.title.11605 SMI