This article is from the Locksmithing FAQ, by Joe "Spike" Ilacqua spike@indra.com and Henry Schaffer hes@ncsu.edu, major data collection effort by Scott Anguish sanguish@digifix.com with numerous contributions by others.
Here are some references:
The Manual of Master Keying, by G.L. Finch available from The National
Locksmith and from his son.
Gerry Finch was highly regarded as a technical writer on locksmithing.
Info, Sales & Support: glfinch@ix.netcom.com
Fundamentals of Master Keying, by Jerome Andrews available from ALOA
Master Keying by the Numbers, by Billy Edwards available from Security
Resources
 
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