Classificação da Biblioteca do Congresso dos EUA (LCC)QE46

19th century(107) American West(104) archaeology(78) archives(47) biography(552) biology(147) Britain(92) California(359) Canada(116) cartography(173) caves(57) chemistry(47) children(115) children's(156) climate(64) creationism(35) desert(31) dictionary(109) dinosaurs(79) earth(769) ecology(122) England(119) environment(158) evolution(190) experiments(69) general science(59) geography(823) geology(10,347) green(47) guide(114) guidebook(400) hiking(42) history(1,344) history of science(384) ice age(23) informational(63) juvenile non-fiction(37) maps(320) mining(56) Minnesota(45) National Parks(158) natural science(110) nature(769) New Mexico(283) North America(89) Northwest(25) oceanography(50) oceans(43) Ontario(36) outdoors(33) paleogeography(18) photographs(105) photography(81) picture book(168) planet(23) planets(36) popular science(120) prehistory(45) reference(630) rivers(30) roadside(19) science(5,181) science and technology(46) Scotland(110) solar system(33) Southwest(78) Texas(63) The West(23) time(39) travel(762) uk(58) US travel(15) usa(377) volcanoes(300) Washington(62) weather(91) Wyoming(127)