Below is (not mine) an upside down Doc White. Since it is upside down the back should be from a column equal columns from the center. For instance, given columns ABCD a typical A back would be a D when upside down. If we can match this back to a right-side-up player we have another data point on sheet width. If both players can be linked by a multi-column horizontal scratch that terminates in a side crop then I think algebra would give us the sheet width. Not a lot to work with here but I think there is scratch between "u" in Subjects and "Pi" in Piedmont. Add in a few stray distinctive marks and someone might recognize it.
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