New Letter Books: copies of outgoing administrative letters of the Royal Society Copies of outgoing letters from the President, Officers and Assistant Secretaries of the Royal Society (primarily the latter). Each page may contain up to four copied documents. Volumes are numbered one to 73 with an additional volume for the period January 1901-November 1904. The Alt Ref No field has been used to indicate the page of each volume at which a copy letter can be found. Volumes have been catalogued to item level. Short letters have been transcribed in full. 1885-1931