Classificação da Biblioteca do Congresso dos EUA (LCC)QE420-499

archaeology(9) attic(5) California(22) chemistry(19) children(89) children's(132) children's literature(15) children's picture book(14) Creation(16) creationism(6) dinosaurs(22) discovery(6) early reader(15) earth(207) easy reader(9) ecology(9) education(25) educational(15) elementary(10) environment(34) evolution(11) experiments(14) formation(8) general science(17) geography(55) geology(2,066) Grade 2(15) green(9) guide(69) guidebook(53) handbook(9) history(66) how-to(10) informational(95) informative(17) intermediate(7) juvenile(45) juvenile non-fiction(34) kid(5) kids(38) maps(14) Michigan(12) mining(14) Minnesota(12) natural resources(11) natural science(26) natural world(5) nature(413) New Mexico(17) North America(21) oil(5) outdoors(14) photographs(17) photography(15) picture book(192) pink(6) planet(6) poetry(28) prehistory(8) primary(7) reader(15) Reading Rainbow(6) recreation(5) reference(353) references(6) regional(8) rock(61) sand(37) school(23) science(2,049) science and technology(6) science nonfiction(28) Science/Math(5) stone(10) stones(34) Texas(9) tools(5) travel(41) volcanoes(60) weather(9) Wyoming(7) youth(12)