Matches in Library of Congress for { ?s ?p Frequency standards Congresses.. }
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- 2006284168 subject "Frequency standards Congresses.".
- 2009279579 subject "Frequency standards Congresses.".
- 83150514 subject "Frequency standards Congresses.".
- 87111988 subject "Frequency standards Congresses.".
- 89005947 subject "Frequency standards Congresses.".
- 96200745 subject "Frequency standards Congresses.".