00691nam a2200193Ia 4500 CTU_112046 210402s9999 xx 000 0 und d 609.73 T487 Those inventive Americans Produced by the National Geographic Special Publications Division. Foreword by Leonard Carmichael Washington National Geographic Society 1971 This book emphasizes how original some human beings are and how their creativeness makes life easier for the est of us. Inventors United states Năm Trung tâm Học liệu Trường Đại học Cần Thơ