An Introduction to Logic and Scientific Method is a college level primer on logic. This book was widely used by scholars especially those studying economics as an introduction to logical thought in preparation for intellectual discourse. Ludwig von Mises was known to say that all students of economics should read this book as a first step in their training as economists.
Has a textbook feel about it. Those of you expecting to be entertained will be disappointed. Also, bear in mind that the book is written quite a long time ago, so it's a bit outdated (but not obsolete). Was of great use to me.