This is Helen's out-of-print first sketchbook limited to 500 copies. This copy is heavily thumbed through, but has a nice inkbrush female head sketch inside.
Mingue Helen Chen is a Visual Development artist at Disney Feature Animation (Wreck-it Ralph, Paperman, Frankenweenie), and a graduate of Academy of Art University in SF.
This sketchbook contains a lot of her sketches and personal works. Lovely stuff.