In July, the book "Difference Sets: Connecting Algebra, Combinatorics, and Geometry" by Emily Moore and her co-author, Harriet Pollatsek was published. An early version of the book was used by Professor Moore in a Senior Seminar course here at Grinnell in the Spring of 2012. The back cover describes the book as follows.
"Difference sets belong both to group theory and to combinatorics. Studying them requires tools from geometry, number theory, and representation theory. This book lays a foundation for these topics, including a primer on representations and characters of finite groups. It makes the research literature on difference sets accessible to students who have studied linear algebra and abstract algebra, and it prepares them to do their own research."