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Author: Petri, Helmut
Call no: RP34
Year: 1950
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Author: Petri, Helmut; Petri-Odermann, Gisela
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Author: Petri, Helmut
Call no: 572.99414 PET
Year: 1954
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Author: Petri, Helmut; Petri-Odermann, Gisela
Call no: RP11077
Year: 1964
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Author: Petri, Helmut; Campbell, Ian
Call no: 572.99414 PET
Year: 2011
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