USDA Farmers' Bulletin No. 2130 by J.R. McCalmont; 1964
"Most natural fiber rope manufactured in the United States is made from manila fiber imported from the Philippines, and from sisal fiber imported from the East Indies and Africa. The development of synthetic fibers-nylon, dacron, orlon, saran, glass fiber, and polyethylene has made possible the production of rope with special characteristics for unusual requirements. Wire rope is becoming more common on farms wherever great strength is more important than flexibility. Many modern farm machines require wire rope in their operations."
