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1968
January JANUARY/FEBRUARY ; 18 (1): 2 - 56	March MARCH/APRIL ; 18 (2): 58 - [57]-2	May MAY/JUNE ; 18 (3): 122 - 184
July JULY/AUGUST ; 18 (4): 186 - 256	September SEPTEMBER/OCTOBER ; 18 (5): 258 - 312	November NOVEMBER/DECEMBER ; 18 (6): 314 - 365