** 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. **
Last revised 1997.
Note: Houghton's Mus class is not the same as the old Widener Mus class, of which there are examples in the Widener transfers section of the Houghton stacks. Guidelines for forming Mus call numbers have varied over time, so there are a number of inconsistencies among items already cataloged; reclassification should not be done unless necessary.
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If two editions have the same date, add a lower-case "a", "b", "c" etc. at the end of the date. The letter is assigned arbitrarily as the case arises, in alphabetical order. Letters will not be used to distinguish issues and states, nor will they necessarily follow the order of editions. If the date of publication is unknown, use the latest possible date from the bibliographic record, e.g. if the imprint date is [18--?], use "1899" in the call number. For a multi-volume work with a range of publication dates, use the date of the first volume.
Collections:
If the item is a collection of pieces previously published separately, or a tract volume, follow the general classification scheme: do not add a letter for the title at the end of the Cutter number, precede the date element with a capital "B", and add the last three digits of the publication date, followed by a lower-case letter for the first word of the uniform title, if there is one, or title proper.
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Do not add "no. [x]" to the call number to distinguish a work from others in the same volume, as patrons may confuse this with an opus or serial number.
Scores vs. parts:
If the library has both a score and a separate set of parts, and the call numbers cannot otherwise be distinguished, add a lower-case "p" after the opus, serial, or thematic number in the call number to the parts.
Mus.G4698Sy op.58p Glazunov's Symphony no.6, op.58, in parts
Thematic catalogs:
Thematic catalogs are classified like bibliographies in the general author scheme.
Serials:
Serials follow the general Houghton classification scheme.