Scott National Series Album Pages: U.S. National Perf. Varieties 1975-1998 (10 Pages). These pages reflect the new listings for major perforation varieties as listed for the first time in the 2001 Scott Specialized Catalogue. The pages serve as an addendum to the National album and will not be part of future supplement releases. Stamps with the same design having perforation differences of at least 1/2 perf. gauge are now given a major catalogue number.
