Frank Depman
- A 40-Year Saga Building and Rebuilding of Philadelphia's Walnut Lane Memorial Bridge. Dans: PCI Journal, v. 37, n. 4 (juillet 1992). (1992):
- A 40-Year Saga Building and Rebuilding of Philadelphia's Walnut Lane Memorial Bridge. Dans: PCI Journal, v. 37, n. 3 (mai 1992). (1992):