e trusses, are foot walks 5 feet wide, protected by feet 6 inches; eight spans varying in length from 148 feet trated on p. 323, vol. 30. The builders were the Keystone 4^ inches to 171 feet 6 inches; total length, backwall to back- light and substantial iron lattice railings. We extract our Bridge… … BUDGE OVEB THE MISSISSIPPI, AX KEOKUK, IOWA. 1874 SCIENTIFIC AMERICAN, INC.
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