20th century inventions /

Míreanna comhchosúla

• Discoveries and inventions of the 20th century.
  de réir: Crowther, J. G. (James Gerald), 1899-
  Foilsithe / Cruthaithe: (1966)
• Inventions in the century,
  de réir: Doolittle, William Henry, 1844-
  Foilsithe / Cruthaithe: (1903)
• Discoveries and inventions of the twentieth century /
  de réir: Cressy, Edward
  Foilsithe / Cruthaithe: (1930)
• Eighteenth century inventions
  de réir: Rowland, K. T.
  Foilsithe / Cruthaithe: (1974)
• The sources of invention /
  de réir: Jewkes, John, 1902-
  Foilsithe / Cruthaithe: (1958)