00350nam a2200109 a 450000500170000008200130001710000060003011000320003624501000006826000510016830000210021920251203090654.0  a609bINV  d_  aReader's Digest Association  aInverntions That Changed the WorldbAn Illustrated Guide to Man's Practical Genius Through Ages  aLondonbReader's Digest Association Ltd.c1982  a368p.c24 cm. HB