Classificação da Biblioteca do Congresso dos E.U.A. (LCC)GB

adventure(100) animals(272) Antarctic(20) anthropology(59) beach(177) biology(134) California(80) cave(17) caves(458) chemistry(117) children(192) children's(257) climate(144) climate change(153) climbing(29) coast(22) coastal(28) conservation(120) desert(188) deserts(195) disasters(231) earth(419) easy reader(64) ecology(320) ecosystems(57) elementary(57) environment(573) environmental(47) environmentalism(40) experiments(61) exploration(55) fish(44) general science(28) geography(1,821) geology(1,354) global warming(45) Grade 2(81) green(49) guidebook(51) history(695) hurricanes(82) ice age(23) iceberg(15) informational(261) informative(31) islands(79) juvenile(106) juvenile non-fiction(62) kids(73) land(26) life science(30) maps(124) National Parks(32) natural disasters(354) natural resources(29) natural science(65) nature(1,317) North America(52) ocean(347) oceanography(58) oceans(165) outdoors(59) photographs(106) photography(318) picture book(685) pink(31) planet(16) pollution(42) rain(210) reference(330) rivers(446) sand(26) science(4,213) science nonfiction(54) sea(64) snow(125) social studies(127) storms(37) summer(52) swamp(39) topography(35) travel(453) usa(131) volcanoes(206) weather(830) wildlife(44) world(45)