Schaum's Outline of Descriptive Geometry (Schaum's)

Although this text was written several years ago, it contains a wealth of information about descriptive geometry that is still applicable today. It does an excellent job of walking a person through true length and true size/shape theorems. There are several solved problems and unsolved problems after each chapter. It is an excellent reference for development of shapes of intersecting prisms and layouts of these intersections. Applications for this book can be found in roof design, sheet metal fabrication, cut and fill, topology, vector geometry and more. I teach computer-aided design (CAD) classes for a college and I use this text as my primary text for descriptive geometry. CAD drawings can't always answer true length/size questions. That is why this book is so vital, It is no longer in print and I would recommend buying a copy while you can.