' textbook used by auto design students...........'
 

The Transportation Design Department, Art Center School of Design, Pasadena, California uses this book in their curriculum for auto design, written by Master's Degreed automotive designers, and may be of value to some:
'HOW TO DRAW', by Scott Robertson & Thomas Bertling, now offered as a free PDF
https://archive.org/details/how-to-d...n-pdfdrive.com

Great, thanks.

208 pages plus a couple pages of sketches tagged on at the end, think I got it all in the PDF.

There are certain angles on objects that I still struggle with, and foreshortening seems to get too much massaging and redo's from me. Always room for improvement, even at my age.

Amazing download options:

' Amazing '
 

Truly!
The predecessor to the current university fluid mechanics textbook is also offered free online. I've already shared that one I think.
College texts are expensive. And 'fundamentals' don't change, so any 'free' material can really help jump-start and enjoyable foray into road vehicle aerodynamics.:)