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Responding to Connell's letter of March 9, 1939, Apgar reported that the anesthesia machines were working well since Connell's modifications, answered his questions about the possible source of sparks, and commented on the need to use more common sense in the operating room, to prevent accidental explosions.
Original Repository:
Mount Holyoke College. Archives and Special Collections. Virginia Apgar Papers [MS 0504]