There is the difference between grades of plywood and grades of veneer. Grades of plywood are made up of veneer grades which are used for covering. For example, plywood covered on the front side with grade B veneer and on the back side with BB veneer will have grade B/BB - the first indicates the highest grade.
Formation of Slip-resistant coated plywood SyPly™ plywood grades
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Scheme of forming plywood grades from veneer grades *NSH - unpolished plywood surface
View pictures of plywood by grade
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