Instructions and rulings with reference to transportation of mails by railroads (steam and electric),
issued by the second assistant postmaster general.
APA Citation
United States. Post Office Dept. (1938). Instructions and rulings with reference to transportation of mails by railroads (steam and electric). Washington: U.S. Govt. print. off..
MLA Citation
United States. Post Office Dept. Instructions And Rulings With Reference to Transportation of Mails by Railroads (steam And Electric). Washington: U.S. Govt. print. off., 1938.
Warning: These citations may not always be complete (especially for serials).