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Use of the small "x"At a time when Princeton was expanding the use of the LC classification system over Richardson, it was deemed wise to implement a device whereby Princeton-assigned LC call numbers could be distinguished from LC-assigned LC call numbers. This would obviate the need to check the shelflist before assigning new LC call numbers.The device was to interpose a lowercase "x" just before the book number. Titles whose call numbers were differentiated only by the presence of the "x" would not be considered in conflict (see Duplicate Call Numbers). This policy was adopted by the Division Heads on 25 July 1971 and ceased ca. 1984. The "x" is ignored in shelving, shelf reading, and shelflist filing. If the same number appears with and without the "x", the number without the "x" comes first. Examples: QA267 ND673
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