Geology

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MIKKELSEN, VALDEMAR M.

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LUCIUS, M.

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WEIDICK, ANKER.

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STAHL, ALFRED u. ARTUR EBERT.

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BARBA, ALBARO (ALVARO) ALONSO.

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Leipzig, Wilhelm Engelmann, 1871.

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EINSTEIN, ALBERT (+) NIELS BOHR.

Berlin, Julius Springer, 1926.