Interestingly, Cullum has only "Asst Prof USMA 26-36." I had grown to suspect that some poeple so identified might be in the mathematics department. Pappas, To The Point, p. 174, indicates that Cram joined the Mathematics Department (but Pappas mistakely has 1829 on p. 136).
The Board of Visitors report for 1826 indicates that "Professor Davies and Cadet Cramm [[ sic ]]" examined the cadets in the third section [See American State Papers, #334, appendix H].
Author: United States. Army. Corps of Topographical
Title: Topographical memoir / Thomas Jefferson Cram
Imprint: Fairfield, Wash. : Ye Galleon Press, 1977
SPECIAL COLL-BSMT-B30 F851 .U59 1977
Description: vii, 126 p. : ill. ; 27 cm
Series United States. Congress (35th, 2d session : 1859). House. Executive document ; no. 114
Notes: Reprint of the 1859 ed. published by U.S. Army Corps of Topographical
Engineers, Washington, which was issued as Ex. doc. no. 114 of the 35th
Congress, 2d session, House of Representatives; with new introd
"Of this edition 250 copies were printed. This is copy number 69."
Cram, Thomas Jefferson, 1807?-1883, USMA 1826, Report upon the decay & preservation of timber / by T. J. Cram; made in response to request from the Office of the Chief of Engineers, U.S.A., of 9th of September, 1870, for a report upon the "creosoting" of timber. Washington, D.C. : Engineer Dept., 1871. 26 p.,  folded leaf of plates : ill. ; 24 cm. USMA: SPECIAL COLL-BSMT-B30 TA422 .C8
Cram, Thomas Jefferson, 1807?-1883, USMA 1826, Extracts from "Recollections
jotted down during half a century's active service-four years as a cadet-forty
six years as an officer in the United States Army." SPECIAL COLL-BSMT-B30
SPEC Mss. Description 40 p. ; 25 cm
Colonel, U.S. Army, Engineer. Memoirs of army service including "Major
Thayer's entrance upon the superintendency of the U.S. Military Academy". A
list of distances from the Mansion House, Arlington to various spots in
Washington City is appended
Cullum #332. B-NH: Arty: Asst Prof USMA 26-36: Resd 36 1LT: Asst Engr RR's: Reapt 38 CPT TopEngrs: Top surveys for US 39-61: AsC Gen Wool 61: Supt constr FtWayne MI 63-69: 2BvtsMG: Ret 69 COL: D-Phil PA 20Dec83 a-80: Ob-AR 84. [From 1990 Register of Graduates]
Cram, Ralph Adams, "Ralph Adams Cram at West Point," Hudson River Valley Review, 2004 21(1): 64-71. ISSN: 1546-3486. Is this a relative?