Ross Island Bridge under construction
- 371N5081
- Item
- 1926 -
Photograph of the Ross Island Bridge in Portland during construction, probably in 1926.
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Collections 
- 371N5090
- Item
- 1923 - 1936
Photograph of a ship passing under the Steel Bridge in Portland.
St. Johns Bridge under construction
- 371N5088
- Item
- 1929
Photograph of the St. Johns Bridge in Portland during construction. The bridge opened on June 13, 1931. Image note: Photograph shows discoloration due to deterioration of the negative.