Inventions and discoveries

समान संसाधन

• Discoveries and inventions of the 20th Century
  द्वारा: Crowther, J G
  प्रकाशित: (1966)
• Encyclopedia of inventions
  द्वारा: Ramachandran Kodappally
  प्रकाशित: (2007)
• Inventive man/
  द्वारा: Robert E Mueller
  प्रकाशित: (1964)
• Lokaprasastha sasthrajnarum kandupidithangalum
  द्वारा: Sankunni, T.R
  प्रकाशित: (2006)
• The sources of invention,
  द्वारा: Jewkes, John, 1902-1988
  प्रकाशित: (1969)