United States. Congress. House. Committee on Post Office and Post Roads & ProQuest (Firm). (1921). Letter cancellation-stamp privilege extended to Pageant of Progress Exposition, Chicago, Ill. [publisher not identified].
Chicago Style (17th ed.) CitationUnited States. Congress. House. Committee on Post Office and Post Roads and ProQuest (Firm). Letter Cancellation-stamp Privilege Extended to Pageant of Progress Exposition, Chicago, Ill. Washington: [publisher not identified], 1921.
MLA (9th ed.) CitationUnited States. Congress. House. Committee on Post Office and Post Roads and ProQuest (Firm). Letter Cancellation-stamp Privilege Extended to Pageant of Progress Exposition, Chicago, Ill. [publisher not identified], 1921.
Warning: These citations may not always be 100% accurate.