Stumped by a metric conversion? Wonder how many bushels of grain are in a pile? Confused about which gage electric wire to install? This handy reference guide is as indispensabe as a pocket knife or vice-grips the perfect size for the glove box of every truck. Size, speed and power equivalents, crop porduction formulas, material measurements and quick facts for the farm. Information that never changes. This book will never go out-of-print.