On Wednesday, June 19, 2013 9:48 AM, Karen Coyle wrote:
>So the actual meaning of the subfields is that the 050 $a$b is the LC "call number" (including the class number) and the second 050 $a is an "alternative class number" (?). None of what you provide is even hinted at in the MARC documentation -- which shows the pitfalls of working from that documentation. Is there somewhere that actual *practice* is documented?
G70 of Subject Cataloging Manual: Shelflisting, #7 covers Alternate numbers . I'm not sure if this has been updated in its replacement, Classification and Shelflisting Manual , but G70 is not listed at  as having been renumbered or deleted.
I hope this helps,
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