Relics of materiel rationing during World War II are the little fiber "Red Points" and "Blue Points" that were issued to control commodities. Red Points were used with the purchase of fresh products and Blue Points were used with the purchase of processed products. The Office of Price Administration was the government agency responsible for the program. Ration tokens are collected by color and combination of the control letters found on them. The standard work on the subject is "Baum's Checklist & Album of Office of Price Administration Tokens" by J. W. Baum.