[posted] Posted (#69572, Einstein) !

[Roger Frank]

Fundamental ideas and problems of the theory of relativity, by Einstein.      69572
  [Full title: Fundamental ideas and problems of the theory of relativity]
  [Full author's name: Albert Einstein]
  [Author: Albert Einstein]
  [Link: https://www.gutenberg.org/6/9/5/7/69572]
  [File: 69572-h.htm]

Thanks to Laura Natal Rodrigues (Images generously made available by the
Nobel Foundation.)

Regards,
Roger