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<dl><dd>At head of title: Library of Congress</dd>
<dd>First edition, 1910, prepared under the direction of Mr. Charles Martel, then chief classifier; 2d edition, 1917, under the direction of C. W. Perley, chief classifier</dd>
<dd>Preface to present edition signed: Clarence W. Perley, chief of Classification division</dd></dl><br>Subjects: Perley, Clarence Warner, 1867-; Martel, Charles, b. 1860; Classification</div>
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Library of Congress. Classification Division</div>
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