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1প্রকাশিত 1997“…National Trust for Historic Preservation in the United States…”This revised edition was built upon the success of the 1993 edition of the Landmark Yellow Pages.
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2“…National Trust for Historic Preservation in the United States…”
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3অনুযায়ী Rypkema, Donovan D.“…National Trust for Historic Preservation in the United States…”
প্রকাশিত 2014
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4অনুযায়ী Collins, Richard C.“…National Trust for Historic Preservation in the United States…”
প্রকাশিত 1991
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