1917 March 29. Thornwell Mullally TyL to Arthur MacLennan; San Francisco.
MacLennan's election to the San Francisco Cavalry Troop.
1917 April 21. M. W. Rowell and S. M. Spalding PrD.
"Latest Instructions from War Department" regarding Reserve Officers' Training Camp for the Western Department. Notices about camp's location and purpose and about eligibility for attendance. Likelihood of successful candidates going abroad. List of examining boards and boards' presidents.
1917 April 26. M. W. Rowell and S. M. Spalding PrD.
"Latest Instructions from War Department" regarding Reserve Officers' Training Camp for the Western Department, superseding circular of April 21, 1917. Notices regarding camp's location and purpose, eligibility for attendance, uniforms, and equipment distribution. List of examining boards and boards' presidents. Two copies.
1917 May 1. Headquarters of Reserve Officers Training Camp PrD.
Memorandum listing items to be provided by attendees, including uniform components and toilet articles.
1917 May 14. A[rthur] MacLennan PrDS.
Ordnance receipt listing equipment issued to Arthur MacLennan.
[1917 May]. M. W. Rowell and J. M. Hobson, Jr. PrD.
Authorization for Arthur MacLennan to attend Western Department Reserve Officers' Training Camp. Instructions to United States Quartermasters to allow MacLennan to purchase uniform components.
1917 August 18. Arthur MacLennan TyL to Hunter Liggett; [San Francisco].
MacLennan's request for a transfer to the intelligence department and description of his qualifications, particularly with regard to his work in the newspaper industry.
1918 October 10. Barge E. Leonard TyLS to Arthur MacLennan; San Francisco.
Request for information regarding "oil and mineral land reports" and naturalization papers belonging to C. F. von Petersdorff, in response to an inquiry by von Petersdorff's lawyers.
1918 October 17. Arthur MacLennan TyL to "the Intelligence Officer, Western Department, San Francisco, Cal."; Fort Sill, Oklahoma.
Response to request for information about von Petersdorff papers. Description of his use of von Petersdorff's personal, business, and naturalization papers and their transfer to other cases.
1918 December 5. F. W. Bryant TyD; Fort Sill, Oklahoma.
Order no. 226, listing officers granted 10 days' leave as of December 6, 1918. Names of officers from 46th Field Artillery, including Arthur MacLennan, marked in pencil.
Undated. "Baker" TyNS to "My dear Lieutenant".
Does not recall encountering the [von Petersdorff] oil or naturalization papers.