Craving Earth: Understanding Pica--the Urge to Eat Clay, Starch, Ice, and ChalkEbookCraving Earth: Understanding Pica--the Urge to Eat Clay, Starch, Ice, and ChalkbySera YoungRating: 0 out of 5 stars0 ratingsSave Craving Earth: Understanding Pica--the Urge to Eat Clay, Starch, Ice, and Chalk for later