About KIEHL J R
About Prof. Dr.-Ing. W. Wittke, Beratende Ingenieure fuer Grundbau und Felsbau GmbH, Aachen
About PAHL A
About Bundesanstalt fuer Geowissenschaften und Rohstoffe, Hannover
About Bautechnik
About rock mass test
About Junneling engineering in general
About Mechanical properties of rocks
About ドイツ
About 土工
About 学会
About 作業部会
About 岩盤
About 調査
About 勧告