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Here's a resource which, after 20 years researching local and family history in Ottawa, had eluded me. I bet I'm not alone.
I found out rather by chance talking to Patricia Barlosky at the Centrepointe Branch of the Ottawa Public Library that they have microfilms for some back issues of The Ottawa Citizen, currently for  January 1, 1978 to November 30, 2015. That saved me a trip downtown to the Main Branch which has microfilm of the Citizen from 1846 to date.
OPL genealogist Romaine Honey pointed me to https://ottawa.bibliocommons.com/lists/show/69401111_ottlibgenealogy which has a collection of topic guides including a list of what newspapers are available on microfilm, and where, in the OPL system. The complete list is: Newspapers on Microfilm, Genetic Genealogy, Scotland - Genealogy,, Genealogy Guides for Beginners, Military Records, French Canadians, Palatines, Acadians, Aboriginal People, Loyalists, Tweedsmuir Histories, Family Histories, Local and County Histories, Historical Atlases and Gazetteers, Biographical Dictionaries, Immigration, Naturalization and Emigration, City and County Directories, Newsletters of Societies, Passenger Lists, Land Records and Settlement, Newspaper Indexes for Genealogy, Church Register Transcriptions, Cemetery Transcriptions, Civil Registration, Census Indexes, Genealogy Scrapbooking, Family Reunions, Photographs in Genealogy, Genealogy Software, Identifying Websites, Evaluating Evidence, Guides for Other Countries, Canadian Genealogy Guides, Recommended Genealogy Web Sites.