["YOUNG ADULT FICTION \/ Action & Adventure \/ General","YOUNG ADULT FICTION \/ Romance \/ General","YOUNG ADULT FICTION \/ Science Fiction \/ General","Young Adult Fiction\/Action & Adventure - General","Young Adult Fiction\/Romance - General","Young Adult Fiction\/Science Fiction - General","Action & Adventure","Action & Adventure - General","Adventure and adventurers","Adventure and adventurers;Fiction.","Children\u2019s","Children\u2019s \/ Teenage fiction: Action and adventure stories","Children\u2019s \/ Teenage fiction: Romance and love stories","Children\u2019s \/ Teenage fiction: Science fiction","Fiction-Science Fiction","General","Human-alien encounters","JUVENILE","Juvenile Fiction","Juvenile Grades 7-9 Ages 12-14","Monograph Series, 1st","Romance","Romance - General","Science Fiction","Science Fiction - General","Science fiction.","Space flight","Space flight;Fiction.","TEEN'S FICTION","TEEN'S FICTION - ACTION & ADVENTURE","TEEN'S FICTION \/ ROMANCE","TEEN'S FICTION \/ SCIENCE FICTION","Teenage fiction: Action and adventure stories","Teenage fiction: Romance and love stories","Teenage fiction: Science fiction","YOUNG ADULT FICTION","YOUNG ADULT FICTION \/ Action & Adventure \/ General","YOUNG ADULT FICTION \/ Romance \/ General","YOUNG ADULT FICTION \/ Science Fiction \/ General","Young Adult Fiction\/Action & Adventure - General","Young Adult Fiction\/Romance - General","Young Adult Fiction\/Science Fiction - General","adventure books; sci-fi; sci fi; sci fi books; science fiction; science fiction books; romance books; teen romance books; teen books; books for teens; young adult books; ya books; books for teen girls; teen girl books; teen boy books; books for teen boys; young adult; books for 12 year old boys; books for 12 year old girls; books for 13 year old boys; books for 13 year old girls; jay kristoff; science fiction books best sellers; scifi books best seller; adventure; young adult romance; teen fiction books","adventure books;sci-fi;sci fi;sci fi books;science fiction;science fiction books;romance books;teen romance books;teen books;books for teens;young adult books;ya books;books for teen girls;teen girl books;teen boy books;books for teen boys;young adult;books for 12 year old boys;books for 12 year old girls;books for 13 year old boys;books for 13 year old girls;jay kristoff;science fiction books best sellers;scifi books best seller;adventure;young adult romance;teen fiction books","Children\u2019s \/ Teenage fiction: Action and adventure stories","Children\u2019s \/ Teenage fiction: Romance and love stories","Children\u2019s \/ Teenage fiction: Science fiction"]