Items

Items

• 

  [CJ620ACZ], Letter from Walter Seeley Mallory to Universal Portland Cement Co, Edward McKim Hagar, July 7th, 1911

  1911-07-07
• 

  [E1512AE], Telegram from Thomas Alva Edison to Cement Products Exhibition Co, Edward McKim Hagar, February 11th, 1915

  1915-02-11
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  [E1515AA], Letter from Thomas Alva Edison to Edward McKim Hagar, January 6th, 1915

  1915-01-06