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1יצא לאור 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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3מאת Rypkema, Donovan D."...National Trust for Historic Preservation in the United States..."
יצא לאור 2014
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4מאת Collins, Richard C."...National Trust for Historic Preservation in the United States..."
יצא לאור 1991
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