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Are you Helmut Ritter, author of the books below?
Lausbubengeschichten von Bumski und Schlappenduttel by Helmut Ritter Makromoleküle I by Helmut Ritter Makromoleküle I by Helmut Ritter Makromoleküle I by Helmut Ritter Advances in Polymer Science, Volume 194 by Shiro Kobayashi Praktikum der Makromolekularen Stoffe by Dietrich Braun Polymer Synthesis by Dietrich Braun Geburtshilfe unter einfachen Bedingungen by Jürgen Wacker


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