Since C57, 12, 91-1995 was published on April 25, 1996, members of the original Working Group and other users have pointed out errors in the published document. A corrigenda is needed to inform users of the corrections and to permit incorporation of corrections into future printed copies. A corrigenda is also needed prior to conducting a Reaffirmation ballot prior to the document expiration date of April 25, 2001. IEEE has a duty to past and future purchasers of this document to publish a corrigenda.