Extensive ten chapter history of the construction. Topics include highs and lows, tunnelling method...
Illustrated scholarly essay which discusses the theories about the methods of construction of this ...
Opened in 1891, running under the St. Clair River, which joins Lake Huron to Lake St. Clair. Includ...
Illustrated essay on the construction history of the Cascade mountains tunnel completed in 1929.
Construction history, restoration details and photo gallery of the longest, highest and deepest can...
Comprehensive range of commentary, data, history and construction images.
Facsimile of the letter from the Secretary of War, transmitting the report of the commission to exa...
Full text of this 1875 book by John B. McMaster.
Full text of this document providing detailed reports from the heads of department for the year end...
Facsimile of the 1872 report of the commissioners and evidence taken by the committee on mines and ...
Illustrated commentary on tunnelling methods used in the 19th century.
Short contemporary commentary by Francis Fox about the construction of the Simplon tunnel through t...