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1by Butterfield, Paul R., 1901-
Published 1932Göttingen : [s.n.], 1932.1 online resource (82 p.)“...[s.n.],...”
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2by Butterfield, Paul R., 1901-
Published 1932Göttingen : [s.n.], 1932.82 p. ; 23 cm.“...[s.n.],...”