Author: Malzahn, E.
Title: Die deutschen Zechsteinbrachiopoden mit besonderes Berücksichtigung der stammengeschichtlichen Beziehungen von Productus horridus Sow. zu Productus timanicus Stuck.
Description: Berlin, Preussischen Geologischen Landesanstalt, 1937. Large 8vo. 77 pp., six text figures, four plates. Original printed wrappers. = A detailed study comparing many "varieties", and their phylogenetic indications and implications. Two small stamps on front wrapper top margin, otherwise a very good clean copy.

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