Betty G. Y. Shields, Susan C. Holton, and Harton S. Semple Jr., staff of the Sewickley Valley Historical Society, have drawn on their command of and enthusiasm for local history to...показать большеBetty G. Y. Shields, Susan C. Holton, and Harton S. Semple Jr., staff of the Sewickley Valley Historical Society, have drawn on their command of and enthusiasm for local history to produce this survey.показать меньше