Discoveries and inventions of the 20th century /
Crowther, J. G. 1899-
Discoveries and inventions of the 20th century / J. G. Crowther - 4th ed., entirely rev. and rewritten. - London : Routledge & Paul, 1955. - xvii, 432 p. : ill. ; 23 cm.
Includes index
Inventions.
608 / CRD 1955
Discoveries and inventions of the 20th century / J. G. Crowther - 4th ed., entirely rev. and rewritten. - London : Routledge & Paul, 1955. - xvii, 432 p. : ill. ; 23 cm.
Includes index
Inventions.
608 / CRD 1955