1. Henke Coll 1_22 Reference (shelfmark): Henke Coll 1_22 Title: United States of America Centennial of the American Institute of Architects Issue 3c stamp Scope & Content: Marginal block of four perforated MNH stamps. This issue was designed by R. Schultz. Engraved by R. Bower and R. Barrick. Collection Area: Philatelic Collections Languages: English Date Range: 23 Feb 1957 Extent: 4 Items