In 1972 and 1973 Lovelock and Margulis composed and circulated their first Gaia articles. After initial rejections at the end of 1972, they published three co-authored Gaia papers in 1974 and a fourth in 1975, lead-authored by Margulis. After this set of original Gaia articles was published, the immediate response was muted at best. Margulis continued to work on her reconstructions of Gaia’s early evolution. However, at mid-decade, Lovelock was embroiled in the ozone controversy, putting their joint efforts on hiatus. Around 1977, Margulis revived their collaboration with a Gaian consideration of planetary atmospheres in light of data from the 1976 Viking mission to Mars. After a decade of Gaia writing in the professional article format appropriate to the introduction of a new concept, they now proceeded to book projects. As the 1970s closed, Margulis was working on her next major book, Symbiosis in Cell Evolution, while Lovelock was putting finishing touches on his first book, Gaia: A New Look at Life on Earth.