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1973
January January; 21 (1): 1 - 400	March March; 21 (2): 401 - 659
May May; 21 (3): 661 - 865	July July; 21 (4): 867 - 1016
September September; 21 (5): 1019 - 1175	November November; 21 (6): 1177 - 1326