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2. R. M. Polichar, W. R. Dunham and R. H. Sands, in preparation.
3. American Magnetics, Inc., 461 Laboratory Rd., Oak Ridge, Tenn. 37830, U.S.A.
4. Cryogenic Associates, 1718 N. Luett Ave., Indianapolis, Ind. 46222, U.S.A.
5. Ranger Engineering Corp., 3132 Bryan St., Fort Worth, Texas 76110, U.S.A.