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|1.||Duckworth, H.E.||Bisects of the 6 cent large queen||1974|
|2.||Milks, John E.||The use of x-ray fluorescence analysis to characterize printings of early Canadian stamps [1851-1897]||1991|
|3.||Studd, M.A.||Canada, 1868 large cents issue; re-entries on the 6 cents value||1930|
|4.||Trimble, R.||A 6c large queen re-entry||1989|
|5.||Trimble, R.||The 5c on 6c small queen - Three distinctly different plate positions found...||1990|
|6.||Trimble, R.||The major re-entry on the 6c large queen||1992|