Clasificación de la Biblioteca del CongresoTC73.B53

19th century(26) activism(7) Africa(12) agriculture(26) American West(30) archaeology(14) architecture(65) Arkansas(5) beach(7) biography(32) boats(32) bridges(5) California(85) Canada(10) canals(178) civil(12) climate(12) climate change(26) coast(5) conservation(30) construction(40) design(10) development(17) disasters(7) ecology(43) economics(17) Egypt(25) energy(14) engineering(172) environment(139) environmental(13) environmental issues(6) environmental policy(5) environmental studies(7) environmentalism(7) Europe(12) 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(7) Middle East(11) mills(6) natural disasters(7) natural resources(10) nature(35) nautical(6) New Deal(16) New Mexico(41) New York(23) Northwest(5) ocean(11) photographs(19) photography(42) pink(9) policy(8) politics(39) reference(31) resources(8) rivers(61) science(95) Scotland(11) sea(10) shipping(9) ships(27) Southwest(14) sustainability(13) topography(10) travel(49) U.S. History(9) usa(45) Washington(12) Washington State(8) watershed(16) windmills(6) World's Fair(11)