This post reviews Tina Marie Jorgenson, “Homeschooling in Iowa: An Investigation of Curricular Choices Made by Homeschooling Parents” (Ph.D. Diss.: University of Iowa, 2011). [Available here]
This doctoral dissertation uses data compiled from Form A of the Competent Private Instruction Report, which the state of Iowa requires all independently homeschooling parents to fill out. From this data she was able to get a pretty good sense of what kind of Iowans homeschool, what curriculum they use, and why they do what they do.
A second, fully revised edition of my 2008 book Homeschool: An American History, was published in March of 2017. 
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Homeschooling Research Notes 