Memo from Lester D. Earnest to Jon A. Erickson dated October 3, 1975, Letter from Edward A. Feigenbaum to P. Surra dated December 8, 1975, Memo from Polly Crandall to Rosa McNair dated March 5, 1976, and Letter from Fred A. Gustafson to Ronald Ohlander dated May 28, 1982