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The following are the errata for the KEMWorks Pocket Fertilizer Manual:

4th Edition - 2001

Page 28 to convert kWh to Btu multiply by 3.411E+3

Page 40 about one third of the way down.
The formula should be:

BHP = Q x psi / 1715 x Eff.

5th Edition - 2001

None known.

6th Edition - 2002

None known.
7th Edition - 2003
None known.