The transatlantic mail

U.S. Postal Service

United States. General Accounting Office

1987

U.S. Postal Service

United States. General Accounting Office

1987

Treaties, etc

Indonesia.

1954

Treaties, etc

Pakistan.

1991

Memorandum

Canadian Pacific Railway Company

1886

China Mail-Service

United States. Congress. House. Committee on Appropriations

1874

Reichsposteinrichtungen auf fremdem staatsgebiet im frieden

Hans Rave

1921

A history of the deliberate interference with the flow of mail

Benjamin A. Gilman

1989