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            6Some social-anthropological observations on gotong rojong practices in two villages of central JavaArgitaratua 1961Liburua
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            8The Wilopo Cabinet, 1952-1953 a turning point in post-revolutionary IndonesiaArgitaratua 1958Liburua
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            9The beginnings of the Indonesian-Dutch negotiations and the Hoge Veluwe talksArgitaratua 1958Liburua