De trilobitis : dissertatio petrefactologica ... / Hermanus Frider. Emmrich Emmrich, Hermann Friedrich, 1815-1879 creator text book Berolini 1839 1839
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LAT Trilobites Museum of Comparative Zoology--Biodiversity Heritage Library digitization project https://www.biodiversitylibrary.org/bibliography/9665 81270168 10.5962/bhl.title.9665 HMZ