Clasificación de la Biblioteca del CongresoCB156-156

alien(32) aliens(197) alternate history(234) alternative(10) ancient(17) ancient astronauts(201) ancient civilizations(115) anthropology(27) antiquity(25) Apologetics(7) archaeology(191) astrology(6) children(5) Christianity(9) Commentary(5) consciousness(5) conspiracies(6) conspiracy(83) conspiracy theory(22) controversy(6) cosmology(20) crazy(7) Curiosities and wonders(9) debunking(8) earth(8) Egypt(18) Engels(7) esoteric(42) esotericism(19) evolution(6) extraterrestrial(36) Extraterrestrials(252) fantasy(22) folklore(6) folklore and mythology(7) fringe(9) Genesis(6) God(8) gods(16) gold(5) historical(5) history(280) human origins(8) humor(8) India(8) Interplanetary voyages(13) legend(13) metaphysical(6) metaphysics(14) mysteries(22) mystery(52) mysticism(7) myth(19) myths(5) occult(88) occultism(6) origins(17) os(5) paranormal(93) parascience(6) prehistoric(7) prehistory(20) prophecies(11) prophecy(12) pseudohistory(43) pseudoscience(118) psychic(12) psychology(5) pyramids(17) reference(6) religion(123) research(12) retail(5) science(107) science fiction(71) secret societies(7) sff(8) Sirius(12) skepticism(10) South America(6) speculation(59) speculative(20) speculative history(47) spirituality(13) Sumerian(5) supernatural(8) weird(7)