For fundamental skill, figure drawing seems to be important. I like the DVD course offered by Glenn Vippu (vippuacademy.com or vippustore.com). For books, I like Figure Drawing for Comics and Graphic Novels. Also, Movement and Form by Samantha Yousseff is quite good (studiotechnique.com). If you want to draw from the figure, I like the Live Model series of books and DVDs (livemodelbooks.com). There are many good sources of information. Of course, it depends on what you want to draw.
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