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NATIONAL INST. OF STANDARDS AND TECHNOLOGY (BFRL), GAITHERSBURG, MD. Office of Applied Economics; FEDERAL ENERGY MANAGEMENT PROGRAM, WASHINGTON, DC
NATIONAL INST. OF STANDARDS AND TECHNOLOGY (BFRL), GAITHERSBURG, MD. Office of Applied Economics; FEDERAL ENERGY MANAGEMENT PROGRAM, WASHINGTON, DC
NATIONAL BUREAU OF STANDARDS (NML), BOULDER, CO. TIME AND FREQUENCY DIV
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