Convention concerning the exchange of parcel post between the United States of America and the Polish Republic.
APA Citation
United States. Post Office Department. (1923). Convention concerning the exchange of parcel post between the United States of America and the Polish Republic. Washington: [publisher not identified].
MLA Citation
United States. Post Office Department. Convention Concerning the Exchange of Parcel Post Between the United States of America And the Polish Republic. Washington: [publisher not identified], 1923.
Warning: These citations may not always be complete (especially for serials).