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** STARTING FY22, THE RARE BOOK SECTION WILL IMPLEMENT USING ACCESSION NUMBERS AS CALL NUMBERS AND WILL NO LONGER CLASSIFY ITEMS AS OUTLINED IN THIS SECTION. **

This class comprises books and serials (primarily 19^th-century) illustrated with original mounted photographs. (Other similar works are classed in TypPh and Horblit TypPh.)

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For the third element, follow normal Houghton practice. Separate the second and third elements with a period, no space.

For serials, construct the call number as you would using the regular Houghton classification, then prefix it with Phot and a space.