Phil,

As the scope note in the authority record for this subdivision indicates, it is
to be used as a subdivision following geographic headings for countries,
regions, cities, etc. I recall a conversation with folks at LC G&M awhile ago
in which they created this subdivision because of the formerly common
comparative area maps found on earlier CIA maps, most often the country in
question was overlayed on a map of the U.S. or North America. These were/are
found on the large CIA maps, not the 8 1/2 x 11 inch ones.

Since rivers are geographic entities I do believe you could use this
subdivision appropriately under the names of individual rivers given in 651
fields, but then, what happens if you've got, say, more than three rivers? It
can become a nightmare in a hurry!

Paige

>--- Begin Forwarded Message ---
>Date: Wed, 29 May 2002 00:42:46 GMT
>From: [log in to unmask]
>Subject: Maps, Comparative
>Sender: [log in to unmask]
>
>
>
>Is it OK to use the form subdivison "Maps, Comparative" under topical
>subjects?  For example
>
>650  _0  Rivers $v Maps, Comparative.
>
>Note in subject authority record implies that it might be limited to use
>after a geographical heading.
>
>
>
>
>Phil Hoehn, Librarian
>David Rumsey Collection
>San Francisco
>[log in to unmask]
>http://www.davidrumsey.com
>--- End Forwarded Message ---

Paige Andrew
Faculty Maps Cataloger
   and Associate Librarian