There are two versions of the manuscript, an April 1981 draft of the paper written by Waller and Warfield, and a January 1982 59 page version which includes the IBM contribution to the article (pp. 38-41) written by Maureen Tondreau. The manuscripts are located in Warfield Special Collection at Fenwick Library, in Box 5, Folder 27. Copies were made of this paper and placed in the IASIS file. (r.w. circa 1998)