Discoveries and Inventions of the 20th Century /
Crowther, J.G..
Discoveries and Inventions of the 20th Century / Textual Documents J.G.Crowther. - 4th Rev. ed. / - London : Routledge and Kegan Paul , 1955. - 432p. : ill ; 22cm .
Science and Technology Discoveries-20th Century Inventions-20th Century G-Mathematics
509 / C 886 D
Discoveries and Inventions of the 20th Century / Textual Documents J.G.Crowther. - 4th Rev. ed. / - London : Routledge and Kegan Paul , 1955. - 432p. : ill ; 22cm .
Science and Technology Discoveries-20th Century Inventions-20th Century G-Mathematics
509 / C 886 D