The Lumberman's Hand Book: For the Inspection and Measurement of Lumber and Logs. E-book. Formato PDF William B. Judson   -  Forgotten Books, 2017  - 

Sec. 9. All merchantable White Pine lumber shall be classified as follows, for purposes of Inspection First Clear, Second Clear, Third Clear, Common and Shipping Culls; and boards six inches wide shall be known as Strips. Norway Pine shall be classified as Common and Shipping Culls, except as hereinafter provided.