Indiana lawyer Douglas G. Amber last week published the sixth revised edition of Cases & Materials on American Federalism an online textbook he wrote for the American government classes he teaches at Purdue University Calumet. Although he wrote the text for college freshman, Amber, a partner with Amber, Golding & Hofstetter, Munster, Ind., relies heavily on original source documents and court opinions, making it of value to anyone with an interest in federalism and its origins. The text covers such topics as American socio-political heritage, constitutional beginnings, and the consequences of federalism. Each chapter is set out in outline form, with links to full-text cases and documents.