The postal laws and regulations pertaining to the second class of mail matter.
Promulgated by authority of the postmaster general.

APA Citation

United States., United States. Post Office Department. (19). The postal laws and regulations pertaining to the second class of mail matter. Washington: Govt. print. off..

MLA Citation

United States, and United States. Post Office Department. The Postal Laws And Regulations Pertaining to the Second Class of Mail Matter. Washington: Govt. print. off., 19.

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