Matches in Library of Congress for { ?s ?p Photoelectric measurements.. }
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- 57004479%2FL%2Fr85 subject "Photoelectric measurements.".
- 72499736 subject "Photoelectric measurements.".
- 73326803 subject "Photoelectric measurements.".
- 77465319 subject "Photoelectric measurements.".
- 77580393%2F%2Fr932 subject "Photoelectric measurements.".
- 82155929 subject "Photoelectric measurements.".
- 83021382%2F%2Fr92 subject "Photoelectric measurements.".