TY - BOOK ID - 127725601 TI - Discoveries and inventions of the 20th century. AU - Crowther, James Gerald AU - Cressy, Edward PY - 1955 PB - London : Routledge and Kegan Paul, DB - UniCat KW - Inventions. UR - https://www.unicat.be/uniCat?func=search&query=sysid:127725601 AB - ER -