Passport to Magonia (1969).
hypothesissource_actorScience of UAP
Vallée's 1969 book joining the UFO record to the folklore record (fairies, religious visions, abduction motifs). Methodological core: treat folklore + UFO reports as one dataset; the same encounter structure (craft, non-human beings, contact, departure) recurs across centuries. Introduces the parallel-worlds framing that becomes the IDH. Book = documented; its parsimony argument = claim.