H2O Casebook Collection – Search inside H2O’s collection of 452 casebooks, 10,765 legal documents, and 161 authors, or view our featured casebooks. “H2O is a free platform for making, sharing, and remixing open-licensed casebooks and other course materials. It is developed and maintained by the Library Innovation Lab at the Harvard Law School Library. With H2O, educators can drastically reduce textbook costs for their students, gain control over their course materials, and collaborate toward new approaches to law school curriculum.”