Compensation & Pension Service Directives (U.S. Department of Veterans Affairs)
The best collection of electronic Code of Federal Regulations (CFR) is maintained by National Archives and Records Administration (NARA).
NARA's main site is here: e-CFR.
38 CFR for All Department of Veterans Affairs
38 CFR, Part 3 - Adjudication
38 CFR, Part 4 - Schedule for Rating Disabilities
38 CFR, Part 13 - Fiduciary Activities
VA maintains its references in WARMS (Web Automated Reference Material System)
The following link is maintained by GPO (Government Printing Office): Title 38, U.S.Code
Compensation & Pension Reference Materials are located on the Veterans Benefits Administration References Web Automated Reference Material System (WARMS). WARMS also contains the 38 Code of Federal Regulations.
More links will be added as we enlarge our reference system. In the meantime, all reference materials can be found in WARMS. WARMS has an index of manuals and a search function.