Official proceedings /
Biennial Convention, National Association of Letter Carriers.

APA Citation

National Association of Letter Carriers (U.S.). Convention. (1972). Official proceedings. [Washington, D.C.?: The Association.

MLA Citation

National Association of Letter Carriers (U.S.). Convention. Official Proceedings. [Washington, D.C.?: The Association, 1972.

Warning: These citations may not always be complete (especially for serials).