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18Published 1975Subjects “...Geology Ethiopia Congresses....”
Conference Proceeding Book -
19by Arkell, William Joscelyn, 1904-1958Subjects “...Geology, Stratigraphic Jurassic....”
Published 1956
Book -
20by Arkell, W. J. (William Joscelyn), 1904-1958Subjects “...Geology Great Britain...”
Published 1933
Book