The following U.S. hardwood grading guide is presented in Adobe Acrobat (PDF) format. To download and install the free Adobe Reader click the Get Adobe Reader icon 
 

U.S. Hardwood Grading Rules (16 pages) Measurement, FAS and FAS/1F Grades, No. 1C and No. 2AC Grades, Ash, Cherry, Cottonwood, Gum, Hard Maple, Soft Maple, Red Oak, White Oak, Tulipwood, Walnut, and Summary of U.S. Hardwood Lumber Grades