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Jackson, Willard L. ,  [Guide to grading defects in ponderosa and sugar pine logs] ,  Guide to grading defects in ponderosa and sugar pine logs

Gaines, Edward M. ,  [Pocket guide to the improved grading system for ponderosa pine and sugar pine; saw logs in trees] ,  Pocket guide to the improved grading system for ponderosa pine and sugar pine; saw logs in trees