Some asked me where they could get the book I was referring to.
If you go to the NeLMA site at
www.nelma.org and select "reference" you'll see the first item is "2006 Standard Grading Rules for Northeastern Lumber" and the cost is: $8.00
Here is the direct link:
http://www.nelma.org/reference/order-nelma-publications/Probably plus shipping. But that is where you can get the book I use.
Jim Rogers