1. Henke Coll 1_2 Reference (shelfmark): Henke Coll 1_2 Title: United States 75th Anniversary of Colorado Issue 3c stamp Scope & Content: Marginal block of four perforated MNH stamps depicting Mount of the Holy Cross, the State Seal and Capitol. Collection Area: Philatelic Collections Languages: English Date Range: 1 Aug 1951 Extent: 4 Items