"Tunkhannock Viaduct" . . . . . . . . . . . . . . . . . . "1915" . . "railroad traffic" . . . . . . . . "May 1912" . "723.9" . . . "54.864" . . . . "0011" . . . . . . "Tunkhannock Viaduct" . "1915-11-06" . "10" . . . . . .