United States Postal Service text Washington, D.C The Service 1998- monographic United States Postal Service Title from title screen (viewed on Apr. 9, 1998) United States Postal Service. Postal service Statistics P 1.60: P 1.60: http://purl.access.gpo.gov/GPO/LPS352 http://purl.access.gpo.gov/GPO/LPS352 20160527184141.0 301946