: A Bilingual Knowledge Bank is a syntactically and referentially structured pair of corpora, one being a translation of the other, in which translation units are cross-codexl between the corpora. A pilot implementation is described for a corpus of some 20,000 words each in English, French and Esperanto which has been cross-coded between English and Esperanto and between Esperanto and French. The aim is to develop a corpus-based general-purpose knowledge source for applications in machine translation and computeraided translation.