Question: Raymond Palmer co-wrote The Coming of the Saucers with an American aviator and businessman who made what is considered the first widely reported unidentified flying object sighting when?
Sentence (from "Raymond A. Palmer"): In addition to magazines such as "Mystic," "Search," and 'Flying Saucers," he published numerous spirtualist books, including "", as well as several books related to flying saucers, including "The Coming of the Saucers," co-written by Palmer with Kenneth Arnold.
Relevant evidence: Yes