Lest We Forget Thee Earth

Lest We Forget Thee, Earth is a fix-up novel derived from three short stories written by Robert Silverberg under the pen-name Calvin M. Knox and released in 1958. They are, in order; "Chalice of Death", "Earth Shall Live Again!" and "Vengeance of the Space Armada". This novel extends the three stories previously published in 1957 and 1958 in the magazine Science Fiction Adventures.