In 1999, roundwood output from Oklahoma's forests totaled 120 million cubic feet. Mill byproducts generated from primary manufacturers totaled 51 million cubic feet. Almost all plant residue was used primarily for fuel and fiber products. Pulpwood were the leading roundwood product at 54 million cubic feet; saw logs ranked second at 52 million cubic feet. There were 67 primary processing plants operating in Oklahoma in 1999. Receipts totaled 151 million cubic feet.