Grulke, Wolfgang. (2014). Heteromorph; the Rarest of Fossil Ammonites: Nature at its most Bizarre. At One Communications, 1st edition. HB.

Grulke, Wolfgang. (2014). Heteromorph; the Rarest of Fossil Ammonites: Nature at its most Bizarre. At One Communications, 1^st edition. HB. Illustrated paper-covered boards. Large format. Not issued with dust jacket. New.  Lavishly illustrated with colour graphics and photographs within the text. Out of print and in demand. In new condition.