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le Arthur Getis, Judith Getis, Mark Bjelland, Jerome D. Fellmann
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Foilsithe 2011

The Book of Iran : A Survey on the Geography of Iran

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Foilsithe 2003

Kehidupan di Muka Bumi

le Akhmad Zamroni, Sri Rejeki
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Journal Of Indonesia Economy & Bisnis = Jurnal Ekonomi & Bisnis Indonesia

le Arni Utamaningsih, Eduardus Tandelilin, Suad Husnan, R.Agus Sartono, Hendrik Gamaliel, Slamet Sugiri, Sari Wahyuni, Esther Sri Astut, Karina Miaprajna Utari, Abdul Azis Ahmad, Prasetyo Soepono, Wihana Kirana Jaya, Rijadh Djatu Winardi, Kusdhianto Setiawan, Eddy Junarsin, Sri Handaru Yuliati, Muhammad Ryan Sanjaya
Foilsithe 2013

Link Internet Ensiklopedia Planet Bumi

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Foilsithe 2007