The "COG" in Cognotes is actually an acronym for the Committee on Governance (COG) that was within the Junior Members Round Table (JMRT), which is the original name of the New Members Round Table (NMRT). You can see the evolution of the publication in three 1972 issues of the JMRT Footnotes newsletter; specifically, the March, June, and September 1972 issues.  Also see the reaction to the publication, as written about in the September 1972 "American Libraries" magazine.

Images of Cognotes issues from past Annual Conferences and Midwinter Meetings can be found in one of several places:

2016 Midwinter Meeting

2015 ALA Annual Conference

2015 ALA Midwinter Meeting

2014 ALA Annual Conference

2014 ALA Midwinter Meeting

2013 ALA Midwinter Meeting

2013 ALA Annual Conference

Slideshare has a collection - SlideShare is an online slide hosting service.

NXTbook also has a collection - Nxtbook Media is a privately owned digital publishing company that provides the creation, distribution, and tracking of digital editions of magazines and other digital publications. Nxtbooks use Adobe Flash and XML to display digital publications both online and offline.

ALA Conference Services Office also has some available.