Mahl Memoir, Southern Pacific Co., F-1, Mahl Papers.
Mahl Memoir, E. H. Harriman, O-3, O-4, O-5, Mahl Papers.
Mahl Memoir, P.I. Co., G-4, G-5, G-6, G-7, Mahl Papers.
Mahl Memoir, General Remarks, N-1, Mahl Papers.
Mahl Memoir, Southern Pacific Co., F-12, Mahl Papers.