1. Engineering-News Record 191 Arch Spans Jacked Up and Over Onto Piers
2. No. 12 September 13 1973 pp. 18-19.
3. Billings H . Bridges Viking Press New York N .Y. 1956.
4. Bruce W. H . and Kring C. V. " How St. Georges Tied Arch was Erected " Engineering
5. New s Record Vol. 128 No. I January I 1942 pp . 26-28.