Author: Steinmann, G., 1882.:
Title: Pharetronen-Studien.
Description: N. Jahrb. Miner. Geol. Paläont., 2: pp. 139-191, many figs. on 4 pls. Offprint, orig. wrs. - Calcispongia. - The last plate is a photographic print mounted on thin cardboard containing 5 microphotos. With author's presentation inscription.

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