Letters to the Editor: PDF OnlyProficiency Testing of Drug Analysis LaboratoriesMcCoy, Harry G. PharmDAuthor Information Clinical Director MEDTOX Laboratories, Inc. 402 West County Road D Saint Paul, MN 55112 Journal of Occupational Medicine: April 1991 - Volume 33 - Issue 4 - p 428 Free Abstract Readers are invited to submit letters for publication in this department. Submit them to: The Editor, Journal of Occupational Medicine, PO Box370, Bryn Mawr, PA 19010. Letters should be typewritten and double spaced and should be designated “For Publication.” ©1991 The American College of Occupational and Environmental Medicine
