Robert H. Jackson, Chapman v. Sheridan-Wyoming Coal Company…
“ What is the contract property right assumed? It is a right to nondevelopment of coal reserves in an indeterminate but substantial part of the public domain for benefit of its own lease. It is not a right necessary to the fullest physical development and enjoyment of all the lands plaintiff acquired for itself, and is one not normally appurtenant to real estate. The assumed covenant is purely negative in character and its whole burden is upon other premises owned by the United States in which the plaintiff has no other interest. ”
