Sources for information about Precision versions include:

  1. Precision Today, 2nd Edition, by David Berkowitz and Brent Manley, DBM Publications, Memphis, TN, 2010.
  2. Enhanced Precision, 2nd Edition, by Ronald Beall. Order from
  3. The online notes of Oliver Clarke at
  4. Power Precision, by Alan Sontag, William Morrow & Co, N.Y., N.Y. (1979)
  5. Standard Modern Precision: Getting From Here To There, by Daniel O’Neill (2011). Avalable e-book online at

I’d also like to thank partners Yih-Renn Kan, John Engstrom, and the late Dennis Tretheway for their insights and suggestions.