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1per Helmholz, R. H.Location: University Libraries of CUA, Catholic University of America
Publicat 1987
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2per Helmholz, R. H.Location: University Libraries of CUA, Catholic University of America
Publicat 1983
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3per Helmholz, R. H.Location: University Libraries of CUA, Catholic University of America
Publicat 1996
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4Publicat 1992Altres autors: “...Helmholz, R. H....”
Location: University Libraries of CUA, Catholic University of America
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