Clasificación de la Biblioteca del CongresoGB441.B37

adventure(48) American Landscape(5) animals(168) anthropology(24) archaeology(29) beach(170) biology(60) botany(20) California(24) cave(17) caves(452) children(52) children's(89) climate(42) climate change(49) climbing(26) coast(21) coastal(27) conservation(26) desert(162) deserts(167) earth(133) easy reader(22) ecology(127) ecosystems(40) education(21) elementary(18) environment(141) environmental(9) environmental studies(6) environmentalism(10) environments(5) exploration(44) fish(26) geography(726) geology(731) Grade 2(24) guide(14) guidebook(29) hiking(19) Himalayas(10) history(186) informational(82) islands(78) juvenile(33) juvenile literature(11) juvenile non-fiction(25) Kentucky(21) kids(24) land(19) learning(14) life science(19) maps(28) marine(11) mid 20th century(10) National Parks(19) natural science(15) natural world(10) nature(489) New Mexico(13) North America(23) ocean(177) oceanography(32) oceans(48) outdoors(33) photographs(39) photography(155) picture book(159) Portland(12) primary(17) reference(106) rivers(26) sand(26) science(1,147) science nonfiction(13) Scotland(28) sea(29) sea life(16) seaside(6) sets(8) social studies(48) Southwest(15) Subterranean(12) summer(45) swamp(39) topography(18) travel(228) underground(10) usa(56) volcanoes(72) weather(51) wilderness(15) wildlife(30) wind(10) world(15) world geography(5)