Report of Dr. Siemens of his Investigation of the Condition of the Northern Pacific, Nov. 1893, NP, 134 (F).1.7.B, p. 6.
R. Harris to Board of Directors, Nov. 18, 1888, NP, LRR, PV, 137.H.5.3 (B); Wm. Mellen to T. F. Oakes, Oct. 31, 1889, Nov. 2, 1889, NP, LRR, PV, 134.F.1.4 (F); Report of Dr. Siemens of his Investigation of the Condition of the Northern Pacific, Nov. 1893, NP, 134 (F).1.7.B, pp. 7-8.
Oakes to Board of Directors, July 15, 1891, NP, President, Letters Sent, LB 28, vol. 52, 137.H.11.2 (F), 245 ff.
Wm. Mellen to Oakes, July 13, 1891, NP, LRR, PV, 137.H.5.8 (F).
Wm Mellen to T. F. Oakes, Oct. 1, 1890, NP, LRR, PV, 137.H.5.6 (F).
Oakes to J. A. Barker, April 27, 1891, NP, President, Letters Sent, LB 27, vol. 51, 137.H.11.2 (F), 468.