Piers Plowman concordance : Will's visions of Piers Plowman, do-well, do-better, and do-best : a lemmatized analysis of the English vocabulary of the A, B, and C versions as presented in the Athlone e by Joseph S. Wittig. ISBN 0826490662. Published by Continuum in 2001. Publication and catalogue information, links to buy online and reader comments.