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<h2 id="see-also">See also</h2>
<ul><li><a href="/facts/Index_(publishing)/amN9DI6s">Index (publishing)</a></li></ul>

<h2 id="references">References</h2>

<ol>
<li id="fn:1"><p>"thumb index". Bookbinding and the Conservation of Books: A Dictionary of Descriptive Terminology. Foundation of the American Institute for Conservation. Retrieved 8 May 2012. <a href="http://cool.conservation-us.org/don/dt/dt3508.html" target="_blank">http://cool.conservation-us.org/don/dt/dt3508.html</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li>
<li id="fn:2"><p>Popular Mechanics. Hearst Magazines. Sep 1956. p. 184. <a href="https://books.google.com/books?id=peEDAAAAMBAJ&dq=%22index+notches%22+in+reference+books&pg=PA184" target="_blank">https://books.google.com/books?id=peEDAAAAMBAJ&dq=%22index+notches%22+in+reference+books&pg=PA184</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li>
<li id="fn:3"><p>"Google Patents". patents.google.com. <a href="https://patents.google.com/?inventor=Arthur+S+Friedman&before=priority:19790101&after=priority:19690101" target="_blank">https://patents.google.com/?inventor=Arthur+S+Friedman&before=priority:19790101&after=priority:19690101</a> <a href="#fnref:3" class="footnote-back-ref">↩</a></p></li>
</ol>

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