TY - BOOK AU - Jeffrey,Laura S. TI - American inventors of the 20th century T2 - Collective biographies SN - 0894906321 AV - T 39 .J372 1996 PY - 1996/// CY - Springfield, N.J. PB - Enslow Publishers KW - Inventors KW - United States KW - Biography KW - Juvenile literature KW - Inventions KW - History KW - 20th century N1 - Includes bibliographical references (p. 103-109) and index ER -