How to obtain "secret" Executive Order signed by President Nixon

Is it possible to get a copy of President Nixon's secret Executive Order declaring South Dakota, Wyoming, Montana, and North Dakota a "National Sacrifice Area for the mining and production of uranium and nuclear energy"? The source for the quote is: “Hard-Rock Mining on Federal Lands.” 2007. Washington, D.C. www.govinfo.gov/.../CHRG-110shrg40573.pdf. (p. 92). I have searched Executive Orders for President Nixon (www.nixonlibrary.gov/.../executive-orders) but have been unsuccessful so far.

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