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by Guenther, E.
by Howes, F.N.
by ; .
by Ward, A.G.
by .
by Gottardi, G; .
by Schwoerbel, J.
by -- Institute for Scientific Co-operation in Conjunction with the federal Institute for Geosciences and Natural Resources and Numerous Members of German Universities
by Rois, H.H.
by Bernfeld, P.
by Kesner, A.