The first APHA Annual Meeting and Expo took place in Cincinnati, Ohio in 1873. Since then, the Annual Meeting has come a long way. See a full historical list (PDF) of Annual Meetings.
Starting in 2000, the Annual Meeting programs and abstracts have been digital. Programs, abstracts, and virtual expositions are available online from past meetings. For abstracts from Annual Meetings prior to 2000, contact firstname.lastname@example.org.
RAMP: Recorded Annual Meeting Presentations from the 2005-2015 Annual Meetings are available for free. Select the Program and Abstract link. A folder icon next to the session name indicates that recordings are available.