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

19th century(26) activism(7) Africa(12) agriculture(26) American West(30) archaeology(14) architecture(65) Arkansas(5) beach(7) biography(32) boats(33) bridges(5) California(85) canals(177) civil(13) climate(12) climate change(27) coast(5) conservation(30) construction(41) design(10) development(17) ecology(43) economics(17) Egypt(25) energy(16) engineering(180) environment(139) environmental(13) environmental issues(6) environmental policy(5) environmental studies(7) environmentalism(7) Europe(12) factual(8) geography(45) geology(30) Germany(32) global warming(8) Great Depression(13) green(10) handbook(7) history(509) industry(8) lighthouses(25) local(5) maritime(9) Middle East(11) mills(6) natural disasters(7) natural resources(10) nature(35) nautical(7) New Deal(16) New Mexico(41) New York(23) Northwest(5) ocean(12) oceanography(7) photographs(19) photography(42) pink(9) policy(8) politics(39) reference(32) resources(8) rivers(61) science(99) sea(10) shipping(9) ships(29) Southwest(14) sustainability(13) topography(10) travel(49) U.S. History(9) usa(47) Washington(12) Washington State(8) watershed(16) windmills(6) World's Fair(11)