January 1968. 17(1) p. 78-79.
February 1968. 17(2) p. 70-71.
March 1968. 17(3) p. 76-77.
April 1968. 17(4) p. 74-75.
May 1968. 17(5) p. 72-73.
June 1968. 17(6) p. 58-59.
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July 1968. 17(7) p. 74-75.
August 1968. 17(8) p. 68-69.
September 1968. 17(9) p. 76-77.
October 1968. 17(10) p. 70-71.
November 1968. 17(11) p. 54-55.
December 1968. 17(12) p. 60-61.
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