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November 24, 1948 Dr. F. B. Flinn, Columbia University, 15 Amsterdam Avenue, New York City Dear Dr. Flinn: With reference to our letter of November 22nd in which we listed employees scheduled for their blood count and expired air examination, there will be one change for Friday, November 26th. In place of Edna Ruelens, please substitute Ann Griffin. The date of Ann Griffin's last exemination was 1/30/48. Thanking you, we are, Very truly yours, UNITED STATES RAD1UM CORPORATION BY: Office Manager DK:rkh