Announcement of changes in electrical and photometric units. Issued May 15, 1947

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110 1 ‡aUnited States. ‡bNational Bureau of Standards.
245 1 0 ‡aAnnouncement of changes in electrical and photometric units. ‡bIssued May 15, 1947.
260 ‡aWashington, ‡bU. S. Govt. Print. Off., ‡c1947
300 ‡aii, 7 p. ‡c23 cm.
490 0 ‡aUnited States. National Bureau of Standards. Circular ... ‡vC459
500 ‡aAt head of title: U. S. Dept. of Commerce, National Bureau of Standards.
504 ‡a"Selected references": p. 7.
538 ‡aMode of access: Internet.
650 0 ‡aPhotometry
650 0 ‡aElectric units.
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