Accession consists of posters accumulated by Issacs. A significant portion of the accession, over 200 posters, pertains to local interest including the Royal Ontario Museum, the Art Gallery of Ontario, and local and international shows by artists such as Heather Cooper and Michael Snow. Toronto posters also announce events such as the 10th anniversary of the art collective, General Idea, at the CN Tower; an album-release party of the band, Parachute Club; and a call to arms on behalf of the fight against the Spadina Expressway. Many posters also promote local theatre productions including Keanu Reeves' performance in Brad Fraser's 'Wolfboy' in 1984 at the Theatre Passe Muraile and a series of Toronto Workshop posters by Theo Dimson. Other posters are a cross-section of Canada from the Montreal Olympics series, 'Artists-Athletes', and the 1973 Winnipeg Art Gallery exhibition, the Structure of Comic Books, featuring MArvel Comics characters as Nick Nury and Thor. There are 74 international posters, the largest groups are those from Paris in the 1950s and 1960s including a poster featuring George Bracqu's 'Theogonie.' There are also several gallery posters from Amsterdam, New York, Chicago and Minneapolis representing artists such as Jim Dine, Robert Rauschenberg, Claes Oldenberg and Christo.