Mining And Energy Year Book
Buku Teks
Britannica book of the year 1985
Encyclopaedia Britannica Inc., 1985
Buku Referensi
Britannica book of the year 1987
Encyclopaedia Britannica Inc., 1987
Buku Referensi
Britannica book of the year 1988
Encyclopaedia Britannica Inc., 1988
Buku Referensi
Britannica book of the year 1990
Encyclopaedia Britannica Inc., 1990
Buku Referensi
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