<p class="p1">A description is given of the file organization and design of an on-line <span class="s1">cat</span>alog suitable for automation of a library of one million books. A method of virtual hash addressing allows rapid search of the indexes to the catalog file. Storage of textual material in a compressed form allows consid<span class="s1">erable </span>reduction in <span class="s1">storage </span>costs.</p>
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