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2
by Butenandt, A., Debye, P., Drescher-Kaden, F. K., Ficker, H. v
Published 1941
Springer Berlin Heidelberg
Subjects: “...Science, Humanities and Social Sciences, multidisciplinary...”
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3
by Kerschensteiner, Georg
Published 1928
Vieweg+Teubner Verlag
Subjects: “...Philosophy and social sciences...”