----------------------------Original message----------------------------
 
Hello, map catalogers:
 
We've recently begun cataloging maps on OCLC here, and have been inserting
a 690 (local subject geographic) field to include quadrangle names when
appropriate.  However, I have been unable to decide how to distinguish
between different size quads in these subject headings.  So, here is
my question:
 
Does anybody who does this distinguish between 24k, 62.5k, 100k and 250k
quadrangles in their subject headings, and how do you do so?  You can
reply to me directly, or over the net if you think other folks will
be interested.
 
                                        Jim O'Donnell
                                        Caltech Geology & Planetary
                                                Sciences Library
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