Notes about some in Finland found species of non-parasitical worms : (Turbellaria, Discophora, et Oligochaeta fennica) / by Axel R. Spoof
Åbo, Printed for the author, 1889
1889
Harvard University, Museum of Comparative Zoology, Ernst Mayr Library
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Public domain. The BHL considers that this work is no longer under copyright protection.