 Her books are about the life and interaction of nature and animals, and Hammarström illustrated them herself.In 1979, "Två myrors äventyr" and "Svalparet Hirundo" (The Hirundo Swallow Couple, 1915) were republished in new editions.The books "Barn och vuxna I–II" (Children and Adults I–II, published in 1918 and 1920), are about the author's own family.