Crowther, J. G. (James Gerald), 1899- Discoveries and inventions of the 20th Century [by] J. G. Crowther.

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Crowther, J. G. (James Gerald), 1899-

Discoveries and inventions of the 20th Century [by] J. G. Crowther.

Inventions -- History.

Cressy, Edward. Discoveries and inventions of the twentieth century.