1. Acres Consulting Services Ltd.: The general and economic features of the Queenston-Chippewa Development. J. Eng. Inst. Canada, Vol. 3, No. 9, pp. 446–452 (1920).
2. Acres Consulting Services Ltd.: Thorold tunnel — Investigations to determine the cause of cracking in the structure. Rept. to Dept. of Transpt. & Communications, Ontario (1972).
3. Adams, E. D.: Niagara Power. History of the Niagara Falls Power Company 1886–1918. Vol. II, Niagara Falls Power Co., Niagara Falls, N. Y., p. 504. 1927.
4. American Falls International Board: Preservation and enhancement of the American Falls at Niagara: Appendix C — geology and rock mechanics. Final Rept. to the International Joint Commission (1974).
5. Benson, R. P., T. W. Kierans, and O. T. Sigvaldason: In situ and induced stresses at the Churchill Falls Unterground Power House. Proc. 2nd Cong., Int. Soc. Rock Mech., Belgrade, p. 821, 1970.