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