H.J.W.G. Schalke

Environmental monitoring of coal fires in North China : project identification mission report October 1993

J. L. van Genderen, A. Rosema, H.J.W.G. Schalke, 1995 .

The Upper Quaternary of the Cape Flats Area (Cape Province, South Africa)

H.J.W.G. Schalke, H. Schalke, 1973 .