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1por Helmholz, R. H.Location: University Libraries of CUA, Catholic University of America
Publicado 1987
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2por Helmholz, R. H.Location: University Libraries of CUA, Catholic University of America
Publicado 1983
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3por Helmholz, R. H.Location: University Libraries of CUA, Catholic University of America
Publicado 1996
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4Publicado 1992Outros autores: “...Helmholz, R. H....”
Location: University Libraries of CUA, Catholic University of America
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