This ledger appears to have been bound at the top (8-inch side), where the margin is widest. There are several pinpricks running along the top edge of each page--the only evidence of a binding edge in the ledger. I would guess that the artist, or artists, removed the pages from the binding before making the drawings, for the drawings have no standard "ground" as might be found in a bound ledger--that is, with the gutter forming the base of each drawing. It also appears that some of these pages were folded in half on the 10-inch side at one time or another.

A fascinating variant for a ledger.