Classificação da Biblioteca do Congresso dos E.U.A. (LCC)QK1-474.5

agriculture(275) American West(111) art(1,002) biography(458) biology(2,170) botany(11,088) Britain(216) California(468) Canada(333) conservation(80) cooking(284) desert(124) deserts(56) drawing(179) Eastern United States(63) ecology(818) environment(319) Europe(152) evolution(158) exploration(133) flowers(3,630) folklore(242) food(960) garden(752) gardening(3,281) gardens(380) growing(139) guide(643) guidebook(355) Hawaii(174) health(374) herbalism(450) history(1,120) history of science(110) homesteading(64) horticulture(665) informational(130) leaves(110) life cycle(219) life science(177) medicine(332) natural science(146) natural world(59) nature(5,827) nature writing(77) New Mexico(103) North America(821) Northwest(68) outdoors(226) photographs(115) photography(217) picture book(504) poison(104) prairie(104) reference(2,807) roots(50) science(4,773) seed(109) self-sufficiency(102) Southwest(142) spring(349) survival(202) Texas(327) travel(291) trees(1,988) tropical(45) usa(469) Washington(110) wildlife(133)