Sighard Hoerner’s Fluid Dynamic Drag and Fluid Dynamic Lift are classic references in aerospace engineering and fluid dynamics. These books are wonderful for rapid design and analysis work; I adore my copies.

The books remain under copyright until 2045.

I have received multiple requests for purchasing information.

As of 2019, the Hoerner family sells the Drag book at: http://hoernerfluiddynamics.com/

[Older 2014 contact information is below]

Unfortunately (as of 2014), the copyright holder does not have a website or publicly visible contact information. After some due diligence, I found their information:

You can also reach them via email at:
hoernerfdy@sbcglobal.net