RCS vs SCCS: How do the interfaces compare?
RCS vs SCCS: What's in a Revision File?
RCS vs SCCS: What are the keywords?
What's an RCS symbolic name?
RCS vs SCCS: How do they compare for performance?
RCS vs SCCS: Version Identification.
RCS vs SCCS: How do they handle problems?
RCS vs SCCS: How do they interact with make(1)?
Can I get more information on configuration management systems?