00461cam a2200169 4500 547813482 TxAuBib 20050218120000.0 050217s2004||||||||||||||||||||||||und|u TxAuBib Finn, Michael R. Bowstring Arch Bridges of Iowa. Anamosa, Iowa : Wapsi Valley Archaeology, Inc., 2004. 50 pp. 20050218. Bridges.