1. GENERAL RULE
When the work in hand is related to an edition already held by the Library, check to see that the call number of the new edition is the same as that for the edition we already have. (The new edition will, of course, have a different date in the call number.) Generally if the classification number of a later edition is changed from that of an earlier edition, we will change the earlier call number to the new class number so that all editions will sit together on the shelf. If the call numbers differ, the older edition should be pulled and the call number changed to that of the new edition. Subject headings frequently need to be changed also. The cataloger fills out a boxwork form for the older edition.
2. EXCEPTIONS TO THE RULE
2.1 Date of Publication
LC divides certain subjects by date, so that successive editions of a title that fall on both sides of a time division are classified in different call numbers. If the only difference between the old and new call numbers is the addition of a ".2", ".5", or the like to the new call number, the subject is now subdivided by date of publication. In this instance, the different editions are allowed to remain in the two different call numbers. Check the schedules to be sure that this is the case.
For example: Hades. Sheol. Hell.
General works
BT 835 Early through 1800
836 1802-1950
836.2 1951-
2.2 Classed together sets or serials
If the edition already in the library is part of a classed together set or serial, the new edition may be classed separately in its own subject classification.
2.3 Reference materials
When a related edition is to be cataloged to Reference and the earlier edition was already cataloged to Reference, the earlier edition is usually changed to circulating. The cataloger should check with the reference librarians to see if the earlier edition should be "de-refed" or even withdrawn.
If the earlier edition needs to be changed, the cataloger should fill out a boxwork slip to have the book pulled and the necessary changes made by DBM.