1.
図書 |
compiled by K. Peeva and B. Delijska
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2.
図書 |
by Günther Haensch and Gisela Haberkamp de Antón
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3.
図書 |
Royal Geological and Mining Society of the Netherlands ; edited by W.A. Visser
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4.
図書 |
Compiled and arranged on an English alphabetical basis by Hans-Olaf Pfannkuch
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