This Online Library of Lepidoptera Resources is provided by the International Lepidoptera Survey, a nonprofit "organization devoted to the discovery, determination, and documentation, of new butterflies and moths around the world." The regularly updated Online Library (in pdf format) currently holds 33 pages of hyperlinked titles alphabetically arranged by author. The free publications in the Library span several decades and include Contrasting dynamics in the same plant-herbivore interaction; Petaluma, a new genus, with the description of a new species; A study of the Riodinid butterflies of the genus Dodona in Nepal (Riodinidae); and Composition and relative abundance in a temperate zone butterfly fauna, to name a few. Articles listed in the Library appear in such publications as the _Journal of Research on the Lepidoptera_, _Proceedings of the National Academy of Sciences of the United States of America_, _The Taxonomic Report_, and _Annals of the Entomological Society of America_.