Mark's Handbook and Shigley's Mechanical Engineering Design.
Ok, throughout my career I have used Machinery's Handbook for design and Roark's Stress and Strain Formulas for my engineering analysis.
These two books are well know in mechanical design and engineering circles as practical references.
What other practical design and engineering books do you use? Fluids, heat transfer, etc.?
Mark's Handbook and Shigley's Mechanical Engineering Design.
The Structural Engineers Pocket Book is probably the most general guide I use; all the rest are material specific.
ISBN-13: 978-0071457743
ISBN-10: 0071457747
Engineering Formulas by Kurt Gieck is a favorite of mine. It's a collection of formulas that cover a wide range of engineering problems in a very small form factor. It's basically my travel engineering reference.