James L. REVEAL, Norton-Brown Herbarium, University of Maryland Indices Nominum Supragenericorum Plantarum Vascularium Alphabetical Listing by Genera of Validly Published Suprageneric Names http://www.inform.umd.edu/PBIO/fam/inspvindex.html
IUPAC Recommendations 1994 Glossary of Class Names
of Organic Compounds and Reactive Intermediates based on Structure
http://www.chem.qmw.ac.uk/iupac/class/