Information about the Grain Inspection, Packers and Stockyards Administration, Service, Act, regulations, official standards, official criteria, rules of practice, instructions, and other matters related to the official inspection or Class X or Class Y weighing of grain may be obtained by telephoning or writing the U.S. Department of Agriculture, Grain Inspection, Packers and Stockyards Administration, P.O. Box 96454, Washington, D.C. 20090-6454, or any field office or agency of the Service.