These exhibits detail the revolution occuring specifically in November, from November 17th to November 27th.
This was the main portion of the revolutionary action, when people deemed the reward for action to be greater than the risk. Despite how visual this portion of the revolution was however, the action of the revolution began much earlier than this. These months in November were the culmination of the earlier action of the Charter 77 and the inherent fear of 1968.
Krapfl, James and German Democratic Republic and Czechoslovakian political ephemera. Manuscripts and Archives. The New York Public Library.