||Waterways - Dredging Calumet River
||Chicago IL. Submarine blast-breaking bedrock in bottom of Calumet River, preparatory to removal by dredge, on contract from Corps of Engineers, USA. Page 45 from Great Lakes Dredge & Dock Company book.
||1614; http://www.pullman-museum.org/cgi-bin/pvm/mainRecordDisplayXML.pl?recordid=10507; 82-218-p45
||The Industrial Heritage Archives provides reproductions of items from its collections for personal or research use. If an image is to be reproduced in any type of publication or on the web, written permission is required and use fees may be assessed.
||Southeast Chicago Historical Society