Number 16 (July-Dec. 1976) in English, French, Spanish, Russian. - Number 17 (Jan.-June 1977) in English, French, Spanish, Russian. - Number 18 (June-Dec. 1977) in English, French, Spanish, Russian. - Number 19 (Jan.-Mar. 1978) in English, French, Spanish, Russian. - Number 20 (Apr.-June 1978) in English, French, Spanish. Not issued in Russian.