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A Comparative Germanic Grammar, Prokosch's acknowledged masterpiece, offers the student a comprehensive introduction to the phonology and morphology of the Germanic languages. It is accessible yet thorough. Eduard Prokosch (1876-1938) was the Sterling Professor of Germanic Languages at Yale University. He had previously taught at the University of Chicago, the University of Texas, the University of Wisconsin-Madison, Bryn Mawr College and New York University. Professor Prokosch died in an automobile accident while this book was in galley proof.
Selmer et al. (Mon,) studied this question.