Download or read book Photographic Guide to Selected External Defect Indicators and Associated Internal Defects in Black Walnut written by Everette D. Rast and published by . This book was released on 1988 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: S2To properly classify or grade logs or trees, one must be able to correctly identify defect indicators and assess the effect of the underlying defect on possible end products. This guide aids the individual in identifying the surface defect indicator and also shows the progressive stages of the defect throughout its development for black walnut. It illustrates and describes 10 types of external defect indicators and associated defects that are particularly difficult to evaluate.S3.