The American Topical Association publishes the bi-monthly journal
Topical Time, which features articles on thematic and topical stamp collecting, research notes, and society news. Regular columns include “Topics on Postmarks,” “Chapter Chatter,” and “Units in Action.” The journal is available to members in print and digital formats. ATA members participate in regional and international chapters that meet throughout the United States and abroad. As of the early 2020s, the association recognized about forty affiliated chapters, including groups in Canada, Australia, Great Britain, and South Africa. Members with shared collecting interests organize into topical study units that promote research on specific themes such as
Americana or wine on stamps. These study units often compile and publish specialized reference materials. The association also produces handbooks on particular topics in thematic collecting and maintains a checklist service covering hundreds of subjects. These resources provide catalog-style data, such as country, issue date, denomination, and catalogue number, to assist collectors in identifying and organizing topical material. ==Members==