1. Books to buyFood Politics by Marion Nestle.
Eat, Vote, Drink. An illustrated guide to food politics in the US. by Marion Nestle.
Safe Food, by Marion Nestle.
2. Free books2.1 No registration necessary
Food Crimes Report. PDF.
2.2 Paywalled or registration required
At digitalbookindex.org, some of these books are free. Some links redirect to other sites.
2.3 Unknown or a mix of the above.