Classificação da Biblioteca do Congresso dos EUA (LCC)QE363.R63

21st century(11) American(29) analysis(6) antique(47) archaeology(14) art(46) bibliography(8) biology(8) California(15) Canada(17) caves(7) chemistry(61) children(16) children's(24) classic(12) diamond(8) dictionary(17) earth(42) ecology(9) education(8) educational(8) environment(11) family(8) general science(5) geography(30) geology(1,722) gold(6) Great Britain(6) guide(104) guidebook(99) handbook(10) healing(9) hiking(6) historical(16) history(68) horror(6) informational(8) insects(6) instructional(6) juvenile(13) juvenile non-fiction(5) kids(7) local(5) magic(5) maps(29) Mexico(6) Michigan(10) mining(43) natural science(25) natural world(10) nature(319) New Jersey(7) New Mexico(18) North America(16) outdoors(5) photographs(48) photography(9) picture book(14) reference(487) references(16) regional(88) rock(48) school(8) science(900) science and technology(6) science nonfiction(5) Southwest(7) spirituality(8) stone(13) stones(68) systems(5) travel(57) us(10) usa(39) volcanoes(8) Washington(11) youth(5)