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Reference:
| 1876 Chief’s Annual Report of the Chief of Engineers to the Secretary of War for the Year 1876: Appendixes to the Report of the Chief of Engineers. Page 616, Graph #9. United States, Congress, House. 44th Congress, 2d session; Ex. doc. 1, pt. 2, vol. II. Government Printing Office, Washington D.C. https://usace.contentdm.oclc.org/digital/collection/p16021coll6/id/1824/rec/15. | |
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