Operation Chaos is a 1971 science fiction/fantasy fixup novel by Poul Anderson. A sequel, Operation Luna, was published in 2000.
Earthman's Burden is a collection of science fiction and fantasy stories by Poul Anderson and Gordon Dickson. It was first published by Gnome Press in 1957. The story "Don Jones" was original to this collection. The other stories originally appeared in the magazines Other Worlds, Universe and Fantasy and Science …
A Midsummer Tempest is an 1974 alternative history fantasy novel by Poul Anderson. In 1975, it was nominated for the World Fantasy Award for Best Novel and the Nebula Award for Best Novel and won the Mythopoeic Award.
The Corridors of Time is a science fiction novel by Poul Anderson, first published in 1966 as serial in Amazing Stories, May-June 1965 and as book by Doubleday.