6 1 10 Laut & Samudra Imelda Primary Author Updegraff, Robert Additional Author mixed material Jakarta Sinar Harapan 1984 cover_seri_rahasia_alam_raya_laut_samudra.jpg Gunung & Lembah Imelda Primary Author Updegraff, Robert Additional Author mixed material Jakarta Sinar Harapan 1984 cover_seri_rahasia_alam_raya_gunung_lembah.jpg Gempa Bumi & Gunung Berapi Imelda Primary Author Updegraff, Robert Additional Author mixed material Jakarta Sinar Harapan 1984 cover_seri_rahasia_alam_raya_gempa_bumi_gunung_berapi.jpg Cuaca Imelda Primary Author Updegraff, Robert Additional Author mixed material Jakarta Sinar Harapan 1984 cover_seri_rahasia_alam_raya_cuaca.jpg Benua & Iklim Imelda Primary Author Updegraff, Robert Additional Author mixed material Jakarta Sinar Harapan 1984 cover_seri_rahasia_alam_raya_benua_iklim.jpg Sungai & Danau=Rivers and Lakes Imelda Primary Author Updegraff, Robert Additional Author mixed material Jakarta Sinar Harapan 1984 cover_seri_rahasia_alam_raya_sungai_danau_rivers_and_lakes.jpg