Goldman, Nathan C., author
Space commerce: free enterprise on the high frontier
Ballinger , 1985
 Buku Teks
Allen, H.C.
Bush and backwoode a comparison of the frontier in Australia and the United States
Sydney Angus and Robertson 1959
 Buku Teks
A treasury of Australian frontier tales / edited by Bill Wannan
Lansdowne Press, 1961
 Buku Teks
Kintner, William R
The New frontier of war / William R. Kintner
Henry Regnery Comapany, 1962
 Buku Teks
Conroy, Hilary
The Japanese frontier in Hawaii, 1868-1898 / by Hilary Conroy
University of California Press, 1953
 Buku Teks
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