| M021 | CDE 2.1/Motif 2.1 User's Guide |
| M022 | CDE 2.1 - System Manager's Guide |
| M023 | CDE 2.1 - Programmer's Overview and Guide |
| M024A | CDE 2.1 - Programmer's Reference, Volume 1 |
| M024B | CDE 2.1 - Programmer's Reference, Volume 2 |
| M024C | CDE 2.1 - Programmer's Reference, Volume 3 |
| M026 | CDE 2.1 - Application Developer's Guide |
| M027 | CDE 2.1/Motif 2.1 - Style Guide and Glossary |
| M028 | CDE 2.1/Motif 2.1 - Style Guide Certification Check List |
| M029 | CDE 2.1/Motif 2.1 - Style Guide Reference |
| M213 | Motif 2.1 - Programmer's Guide |
| M214A | Motif 2.1 - Programmer's Reference, Volume 1 |
| M214B | Motif 2.1 - Programmer's Reference, Volume 2 |
| M214C | Motif 2.1 - Programmer's Reference, Volume 3 |
| M216 | Motif 2.1 - Widget Writer's Guide |