Area Circulars Area Circulars: numbers 445-503 There are no circulars with the numbers 454, 455, 456, 458, 459, 462, 463, 464, 465, 466, 470, 472, 473, 474, 475, 476, 477, 478, 479, 480, 481, 486, 488, 490, 491, 494, 496, 497, 498, 499, 500, 501, 504 and 505. Entries for these circulars in the accompanying index are blank. 1984