x21.doc        78 472  Recomendation X.21 Interface (DOC format)
x21.ps      1 278 600  Recomendation X.21 Interface (PostScript format)
x24.doc        21 576  Recomendation X.24 Interface (DOC format)
x24.ps         80 795  Recomendation X.21 Interface (PostScript format)