Paper size impossible to encounter ISO standard papers in day-to-day uses, with "Carta" (Letter), "Oficio" (Government-Legal) and "Doble carta" (Ledger/Tabloid) being nearly universal. In Canada, US paper sizes are a de facto standard. The government, however, also uses ISO paper sizes. There is an additional paper size, , to which the name "Government-Letter" was given by the IEEE Printer Working Group (PWG). It was prescribed by Herbert Hoover when he was Secretary of Commerce to be used for US government forms, apparently to enable discounts from the purchase of paper for schools, but more likely due to the standard use of trimming
American Letter Mail Company Company was a vehicle for legal challenge. "Mr. Spooner, the head of the American Letter Mail Company, has transmitted to the Department at Washington, a written admission of his conveyance of letters, &c., with all the necessary facts in the case, to make it a purely legal question, so that the Postmaster General has nothing to do but take the whole subject to the Supreme Court of the United States, as soon as it can be got there." The American Letter Mail Company was able to reduce the price of its stamps significantly and even offered free local delivery, significantly