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<p>Journal of Research of the National Bureau of Standards
</p>
<br>Subjects: Barium sulphate; bidirectional reflectance; bidirectional reflectometer; black coating; gonioreflectometer; magnesium oxide; mu sulphur; reflectance; reflectometer; sodium chloride</div>
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<dl><dd>Hsia, Jack J.</dd>
<dd>Richmond, Joseph C.</dd></dl></div>
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