EBEL, R. & A. EHLING - Der Porta-Sandstein, Geologie, Vorkommen, historischer Abbau und Verwendung. /&/ H. Kaplan: Oberjura-Sandsteine aus dem Wiehengebirge und ihre Verwendung als Bausteine historischer Gebäude.

2012. Geologie und Paläontologie in Westfalen 82; pp. 5-146, 161 fig./phot. most col. phot. 2 plts. with amp. /&/ pp. 147-195, 72 fig. most col. phot. Orig. illustr. covers, very good, sm4to.

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