International pitch standardaized in 1939 or 1925?

[KeyKat88 at aol.com]

Greetings,
 
      I read in Reblitz that A-440 was standardized in 1925. I was told by a 
college music theory instructor that it was 1939. Now, witch year was it 
really?
 
Thanks in advance,
Julia
Reading, PA



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