The book "John Carter of Mars" comprises two novelettes originally
published in Amazing Stories pulp magazine: "John Carter and the Giant
of Mars" was published in the January 1941 issue with the byline "Edgar
Rice Burroughs". However, ERB had nothing to do with the writing of the
story! It was written by his younger son, John Coleman Burroughs. In the
February 1943 issue of Amazing Stories, "Skeleton Men of Jupiter"
appeared, the first part of a 4-part novel. Unfortunately, due to World
War II and the failing health of ERB, the remaining 3 stories were not
written.