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Bk, Letter to Christopher North, 158 - 162, Feb 1823, George Farquhar Graham, Signed "gamma." Claimed by Graham in "An essay on the theory and practice of musical composition" (1838). Eileen M. Curran, VPR 28 (1995), 300.
Bk, 515a, Lettera secunda, spettante a certi punti musicali, indirizzata al Signore Cristoforo North, 722 - 723, Dec 1827, George Farquhar Graham, Signed with Greek letter (gamma). Graham used this signature on an earlier "Letter to Christopher North." Eileen M. Curran, VPR 28 (1995), 286.