See Allo

Frontier Society

Martinus Njhoff, 1971

Buku Teks

Frontier Society

Martinus Njhoff, 1971

Buku Teks

Cole, John W., author

The Hidden frontier

Academic Press, 1974

Buku Teks

Kokot, Jozef, author

The logic of the Oder-Neisse frontier

Wydawnictwo Zachodnie, 1957

Buku Teks

Oceanography the last frontier

edited by Richard C. Vetter

Voice of America, 1974

Buku Teks

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