Bluegrass Interlingua Club
A thorough introduction to the Interlingua language (an international language) with grammar and vocabulary. In both English and Spanish.
Interlingua a Prime Vista
Short history and overview of Interlingua, an international language, with links to other pages.
Interlingua-English: A Dictionary of the International Language
Online version of the 1951 book introducing and explaining Interlingua, a language constructed to be an international language. Includes all the chapters except the dictionary itself, but it does explain the language in great detail.
Valle del Sol
Pages in Interlingua (an international language).