- CATALPA
The online catalog for the New York Botanical Garden Mertz Library. One of the world's largest and most important research libraries concerned with knowledge about the world of plants.
- CLIO
Columbia University Libraries online catalog for books, journal and newspaper titles, online resources, videos, and more. Does not contain citations to articles in magazines, journals and newspapers.
- WorldCat
OCLC catalog of books, journals, sound and visual recordings, internet resources and archival materials in libraries worldwide.