May 1973 The Volga: Russia's Mighty River Road It contains articles about people, nature, the planet, popular science, history, culture, current events, and photography.
March 1973 The Last Whale Hunters. It contains articles about people, nature, the planet, popular science, history, culture, current events, and photography.
Feb 1973 Australia's Wild North It contains articles about people, nature, the planet, popular science, history, culture, current events, and photography.