US PO Forms and Tags

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Form Number	3817
Division
Title	Certificate of Mailing
Where Used	Provides proof of mailing.1915-1929 4th class only; since 1929 all classes
EKU	1937 ASW
LKU	2007 ASW
Notes	Wawrukiewicz, Domestic ch. 44 (1531 possible forerunner
Revision	9-37