"More Exempts from the Draft". The Baltimore Sun. September 16, 1863. Retrieved 2011-01-23. among them the heights of Cemetery Hill and the granite spur of Round Top ... have been purchased by Mr. D. McConaughy
Brown, Andrew (June 2006) [1962]. "GEOLOGY and the Gettysburg Campaign"(PDF). Pennsylvania: Bureau of Topographic and Geologic Survey. Archived from the original(PDF) on 2009-03-20. Retrieved 2010-02-19.
Brown, Andrew (June 2006) [1962]. "GEOLOGY and the Gettysburg Campaign"(PDF). Pennsylvania: Bureau of Topographic and Geologic Survey. Archived from the original(PDF) on 2009-03-20. Retrieved 2010-02-19.