Template:Häntzschel, 1975

• Häntzschel, W.(†) 1975. Trace Fossils and Problematica. Second Edition (Revised and Enlarged). Pp. W1–W269. In: Moore, R.C. (ed.) Treatise on Invertebrate Paleontology, Part W, Miscellanea, Supplement 1. Boulder, Colorado and Lawrence: Geological Society of America and University of Kansas. DOI: 10.17161/tip.v0i0.5426 .  
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