Land resources Departement NRI overseas development administration foreign communication wealth office U.K., 1990,
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UI - Publikasi
contributors, Harry Widianto
Kharisma Ilmu, 2012
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Nita Kurniati, author
Fitrama Sempana, 2007
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Djunaedi Muljawan ... [and others]
Deputi Pengembangan Kekayaan Alam, BPP Teknologi, 1997
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