00340nam a2200121Ia 4500008004100000020001800041082002200059100002000081245005200101260003100153300002200184490001200206241121b        |||||||| |||| 00| 0 eng d  a9780387981406  a519.50182bW637.G  aWickham, Hadley  aGgplot2b: elegant graphics for data analysis /  aNew York:bSpringer,c2009  aviii, 212p. Index  aUse R !