Q:Alien Planet is a science fiction novel by Fletcher Pratt. It was first published in hardcover by Avalon Books in 1962; a paperback edition followed from Ace Books in 1963 and was reprinted in 1973. The book is an expansion of A Voice Across the Years a novella Pratt co-authored with I. M. Stephens (his wife Inga Stephens Pratt) originally published in the magazine Amazing Stories in the issue for winter 1937. Given a list of categories: company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work, what category does the paragraph belong to?
A:
Written Work