1866-1946 action adaptations adventure adventureandadventurers aladdin(legendarycharacter) britishandirishfiction(fictionalworksbyoneauthor) children'sfiction classicliterature comicbooks diseases earth englishlanguage englishliterature englishsciencefiction examinations extraterrestrialbeings fantasy ficcion fiction fictioninenglish general graphicnovels guerra guerrasimaginarias human-alienencounters imaginarywarsandbattles imaginarywarsandbattlesinliterature invasions juvenilefiction largetypebooks lifeonotherplanets literature mars(planet) martians military novela open_syllabus_project openlibrarystaffpicks outerspace romanceingles sat(educationaltest) sciencefiction seresextraterrestres spaceopera spacevehicles spacewarfare strips studyguides vocabulary war warstories wells