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Archive of 1968 Online Issues:

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January
January; 59 (1): 3 - 84

March
March; 59 (2): 87 - 160

May
May; 59 (3): 163 - 220

July
July; 59 (4): 223 - 260

September
September; 59 (5): 263 - 320

November
November; 59 (6): 323 - 392