Thick seam mining, problems and issues : ISTS '92, proceedings of the International Symposium 19-21 November 1992 /Publisher: New Delhi : Oxford & IBH Pub. Co.,
Date: c1992. This title can be found in 1 Iowa libraries.
Land subsidence : International Symposium, 11-15 December 1989 /Publisher: Rotterdam : A.A. Balkema, Rotterdam : A.A. Balkema,
Date: c1991. This title can be found in 2 Iowa libraries.
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