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Subjects: Ionizing radiation -- Instruments -- Standards.</div>
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<dl><dd>United States. National Bureau of Standards</dd>
<dd>American National Standards Institute. Subcommittee N43-3.2</dd></dl></div>
<dl><dd><a rel="nofollow" class="external free" href="https://archive.org/details/americannational129unit">https://archive.org/details/americannational129unit</a></dd>
<dd><a rel="nofollow" class="external free" href="https://archive.org/download/americannational129unit/americannational129unit.pdf">https://archive.org/download/americannational129unit/americannational129unit.pdf</a></dd></dl>