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by Helsing, Cheryl.
Published: U.S. Dept. of Commerce, National Institute of Standards and Technology ; For sale by the Supt. of Docs., U.S. G.P.O., 1989
Description: v, 15 pages ; 28 cm.
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by Helsing, Cheryl.
Published: U.S. Dept. of Commerce, National Institute of Standards and Technology, 1989
Description: vii, 15 pages ; 28 cm.
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by Helsing, Cheryl.
Published: U.S. Dept. of Commerce, National Institute of Standards and Technology, 1989
Description: iii, 13 pages ; 22 cm.
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