Reddit reviews The Roebling Suspension Bridge: A Guide to Historic Sites, People, and Places
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Good, if somewhat outdated, summary of the Cincinnati bridge:
http://library.cincymuseum.org/journals/files/chsbull/v23/n4/chsbull-v23-n4-sus-211.pdf
Newer book on the topic by Don Tolzmann, dean of German-Americana:
https://www.amazon.com/Roebling-Suspension-Bridge-Historic-People/dp/1544004346/ref=sr_1_2?qid=1573006536