[NARCOTICS]. Narcotics Manual Compiled by The Customs Agency Service for the Confidential and Exclusive Use of Treasury Investigative Agencies. Washington, D. C.: [U. S. Treasury], 1937. 4to. Black and white photographic illustrations on nearly every page. [ii], 1-161 leaves (text and illustrations on rectos only). Approximately 10 ? x 8?. Original printed wrappers. Staple-bound (somewhat worn, soiled, creased, rear wrapper mildly chipped at bottom, ?Slotnik? written on front wrapper in grease pencil, text a bit toned). Near fine. FIRST AND PRESUMED ONLY EDITION OF THIS EARLY GUIDE FOR TREASURY FIELD AGENTS TO HELP THEM IDENTIFY NARCOTICS AND SMUGGLING TECHNIQUES.