Pag. 15, 16, 22, 24 (Imgenes: a,b,c,d), 29 (Imgenes: a,b), 31 (Imgenes: a,b,c,d,e),

37 (Imgenes: a,b), 42 (Imgenes: a,b), 45 (Imgenes: a,b,c)

18 (Imgenes: a,b,c),