LETTER TO NATIONAL INSTITUTE OF MENTAL HEALTH RE PRESENTATION OF PAPER TITLED "USE OF A BENZIMIDAZOLE DERIVATIVE WITH POTENT MORPHINE-LIKE PROPERTIES ORALLY AS A PRESUMPTION REINFORCER IN CONDITIONING OF DRUG-SEEKING BEHAVIOR IN RATS" WITHOUT ENCLOSURE

DEPARTMENT OF HEALTH, EDUCATION, AND WELFARE PUBLIC HEALTH 'SERVICE 24 December 1959 National institute of Mental Health Addiction Reaearch Center V.S. Public Health Service Hospital Lexington, Kentucky For your information, i am enclosing the following: 1. A copy of a paper entitled "Use of a Benzimidazole Deriva- tive with Potent Morphine-Like Properties Orally as a Presumptive Reinforcer in Conditioning of Drug-Seeking Behavior in Rats" by Abraham Wikler, Phillip C...