1. CA 6 Reference (shelfmark): CA 6 Title: Standing Authority Registers Collection Area: Philatelic Collections Languages: English Date Range: 1921-1968 Extent: 5 volumes
2. CA 6/1 Reference (shelfmark): CA 6/1 Title: Standing Authority Registers Collection Area: Philatelic Collections Languages: English Date Range: 1921-1951 Extent: 1 volume
3. CA 6/2 Reference (shelfmark): CA 6/2 Title: Standing Authority Registers Collection Area: Philatelic Collections Languages: English Date Range: 1952-1968 Extent: 1 volume
4. CA 6/3 Reference (shelfmark): CA 6/3 Title: Standing Authority Registers Collection Area: Philatelic Collections Languages: English Date Range: 1952-1969 Extent: 1 volume
5. CA 6/4 Reference (shelfmark): CA 6/4 Title: Standing Authority Registers Collection Area: Philatelic Collections Languages: English Date Range: 1952-1970 Extent: 1 volume
6. CA 6/5 Reference (shelfmark): CA 6/5 Title: Standing Authority Registers Collection Area: Philatelic Collections Languages: English Date Range: 1952-1971 Extent: 1 volume