Found these on Ebay:
George street with trolley right of way, 1973:
http://www.ebay.com/itm/ORIGINAL-SLIDE-B...t=LH_DefaultDomain_0&hash=item27d7cd60e4

Similar vantage point today:
https://maps.google.ca/maps?hl=en&ll=45....CJ5ikmqnA67Z9CAu3g&cbp=12,75.68,,0,-2.57
Another pic of George street, 1973:
http://www.ebay.com/itm/OTTAWA-BUS-SLIDE...t=LH_DefaultDomain_0&hash=item5d43354019
EE9s2ufWGSBSGOq!ey5w~~60_57.JPG)
Today:
https://maps.google.ca/maps?hl=en&ll=45....9xYjS8-uzgr4g&cbp=12,80.57,,1,-0.64&z=17
Postcard of Rideau street in front of Ogilvy's, with glass enclosures and an old Orion-Ikarus bus, mid 80s:
http://www.ebay.com/itm/OC-Transpo-Artic...t=LH_DefaultDomain_0&hash=item5d4321a58b