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 The following events occurred in April 1967:
 
  
  
  
  
  
  This article incorporates text from this source, which is in the  public domain .Brooks, Courtney G.; Ertel, Ivan D.; Newkirk, Roland W. "PART II: Apollo Application Program -January 1967 to December 1968.". SKYLAB: A CHRONOLOGY. NASA Special Publication-4011. NASA. pp. 107–109. Retrieved 8 May 2023.
 This article incorporates text from this source, which is in the  public domain .Brooks, Courtney G.; Ertel, Ivan D.; Newkirk, Roland W. "PART II: Apollo Application Program -January 1967 to December 1968.". SKYLAB: A CHRONOLOGY. NASA Special Publication-4011. NASA. pp. 107–109. Retrieved 8 May 2023.