Scott 1002 mint sheet 3c (50) - American Chemical Society, 1951-52 Commemoratives. representative stamp imaged.
Scott 1002 mint sheet 3c (50) - American Chemical Society, 1951-52 Commemoratives. representative stamp imaged.
Scott 1002 mint sheet 3c (50) - American Chemical Society, 1951-52 Commemoratives. representative stamp imaged.