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1nork Helmholz, R. H.Location: University Libraries of CUA, Catholic University of America
Argitaratua 1987
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2nork Helmholz, R. H.Location: University Libraries of CUA, Catholic University of America
Argitaratua 1983
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3nork Helmholz, R. H.Location: University Libraries of CUA, Catholic University of America
Argitaratua 1996
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4Argitaratua 1992Beste egile batzuk: “...Helmholz, R. H....”
Location: University Libraries of CUA, Catholic University of America
Liburua