Clasificación de la Biblioteca del CongresoQL951-991

anatomy(16) animals(228) babies(9) beautiful(5) biology(190) bird(5) birds(182) bugs(7) butterflies(5) chicks(6) children(14) children's(29) children's literature(6) children's picture book(5) development(49) ducks(10) Easter(15) egg(51) elementary(5) environment(11) evolution(21) farm(13) fish(12) genetics(12) Grade 2(5) growing(7) history(6) history of science(13) informational(53) informative(7) insects(26) juvenile(8) juvenile literature(6) juvenile non-fiction(8) life cycle(75) life science(23) literary nonfiction(11) mammals(7) medical(6) medicine(11) metamorphosis(12) nature(126) penguins(6) photographs(11) physiology(5) picture book(147) poetry(7) preschool(10) primary(7) reference(15) reproduction(12) reptiles(29) research(5) science(327) science nonfiction(11) snakes(9) spring(51) turtles(10)