Issued in 2 v., 1961; in 3 v., 1964-83; in 4 v., 1984, 1986- ; in 5 v., 1985: v. 1, National organizations of the U.S.; v. 2, Geographic and executive index; v. 3, 4th-5th eds., New associations; 6th- ed., New associations and projects; v. 4, 18th- ed., International organizations; v. 5, 19th ed., Research activities and funding programs.
New associations and projects (varies), issued 4 months after v. 1, lists additional associations not included in v. 1.
Has inter-edition supplements: Updating service, issued twice a year 1985- lists changes to associations listed in v. 1 & 3; International organizations supplement to v. 4 issued annually 1987-
Rankings indexes issued with the 21st ed.- to provide ranked listings by membership size, staff size, annual budget, and founding date for organizations listed in v. 1.
Available online to subscribers
Beginning with the 23rd ed. (1989), vol. 4: International Organizations was separated from the Encyclopedia of Associations, but retained the edition numbering.
Available online to Stanford-affiliated users as part of Gale's ready reference shelf.