Scope and Contents Por Que?, no.49 (undated); no.50 March 1971; no.51 July 1971; no.52 September 1971; no.53 (undated); no.54 April 1972; no.55 (discusses Apollo 16 launch); no.55.5 July 1972 [reprinted issue]; no.57 January 1973; no.58 April 1974; no.59 (undated); no.60 October 1973; no.61 (undated); no.62 (undated); no.63 (undated); no.64 (undated); no.65 (undated); no.66 (undated); no.66.13 (undated); no.67 (undated); no.68 (udated); no.68.52 [cover appears to have been stapled to Wooden Indian no.2 by...