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Fredrick A. Praeger, 1963
Buku Teks
Taaffe, Robert N
Frederick A Preager, 1965
Buku Teks
Ivashentsov, Gleb
Allied, 1989
Buku Teks
McVey, Ruth Thomas, author
Cornell university, 1962, 1957.
Buku Teks
Weigh, Ken Shen
The Coomercial Press , 1928
Buku Teks