This from Eric Haak:

Saturday (2/13) is the 45th anniversary of the fire and explosion at 6117 N Elston Ave which resulted in the line of duty deaths of Lieutenant William Quinn and Firefighter Martin Dyer.  Both men were inside of the A. A. Englehardt Heating and Appliance Dealership when an explosion sent the roof crashing down on them.  I just happened to recently acquire these color photos of the search for these men as well as the removal of FF Dyer in the final image.  The battalion chief seen looking toward the camera in the one image is Battalion 22.  Also Commissioner Quinn can be seen in the background of the one image.  The photographer was George Mars Cassidy.  Thought I would share these as I do believe they may not have been seen by the public before now.
historic Chicago fire scene photo

George Mars Cassidy photo, Eric Haak collection

historic Chicago fire scene photo

George Mars Cassidy photo, Eric Haak collection

historic Chicago fire scene photo

George Mars Cassidy photo, Eric Haak collection

historic Chicago fire scene photo

George Mars Cassidy photo, Eric Haak collection

historic Chicago fire scene photo as firemen recovery a fallen firemen

George Mars Cassidy photo, Eric Haak collection

News clipping from an historic fire that destroyed mcCormick Place in Chicago on  February 13, 1971

Warren Redick collection

News clipping from an historic fire that destroyed mcCormick Place in Chicago on  February 13, 1971

Warren Redick collection

News clipping from an historic fire that destroyed mcCormick Place in Chicago on  February 13, 1971

Warren Redick collection

News clipping from an historic fire that destroyed mcCormick Place in Chicago on  February 13, 1971

Warren Redick collection