- Civil engineering--United States--History--Congresses (2)
- Civil engineers--United States--Congresses (2)
- Channels (Hydraulic engineering)--Congresses (1)
- Civil engineering--Maryland--Baltimore--History--Congresses (1)
- Hoover Dam (Ariz. and Nev.)--Congresses (1)
- Panama Canal (Panama)--Congresses (1)
- (1)