In the Avery Library, most general museum collection catalogs are classed in N 1000 - N 1060. Many are also classed separately by subject. To find exhibition catalogs in CLIO, you can click on the Guided Keyword tab, and insert "exhibitions" as a word in the subject field, then in the next box add either the museum name or a word in the title or a likely subject word. Exhibition catalogs are separately classed by subject. Listed below are a few guides to finding citations to exhibition catalogs.
Bibliography of the History of Art, International Bibliography of Art, Art & Architecture Complete and Art Bibliographies Modern are good indexes to exhibition cats.
Also a good source for finding museum publications.
National Museum of American Art's Index to American Art Exhibition Catalogues ...through ... 1876. 6 vols. (1986)
Avery Reference N5015 Y22