(1931). [Letter of transmittal for list of customs districts and ports of entry for use of Narcotics Bureau]. [publisher not identified].
Chicago Style (17th ed.) Citation[Letter of Transmittal for List of Customs Districts and Ports of Entry for Use of Narcotics Bureau]. Washington, D.C.: [publisher not identified], 1931.
MLA (9th ed.) Citation[Letter of Transmittal for List of Customs Districts and Ports of Entry for Use of Narcotics Bureau]. [publisher not identified], 1931.
Warning: These citations may not always be 100% accurate.