Some summer lands (Atlan series)

St. Martin's Press, 1979. Hardcover with dustjacket, 1st American edition. Book 5 in the 5-book "Atlan / Cija" cycle. Set in prehistoric South America and in the mythical world of Atlantis. The books in the series are: "The Serpent (1963); "The Dragon" (1963); "Atlan" (1965); "The City" (1966); and "Some Summer Lands" (1977).