Reddit reviews Geometry of Design, Revised and Updated (Design Briefs)

Highly recommend Geometry of Design by Kimberly Elam.

This is a nice, concise book on the subject (as are most the Wooden Books imprint titles).

http://www.amazon.com/Sacred-Geometry-Wooden-Books-Miranda/dp/0802713823/

This book is very nice & has clear overlays that show the geometry so you can go see the geometry in the design & then also see the design by itself - at least the 1st edition had that, I can only assume the 2nd edition keeps this feature.

http://www.amazon.com/Geometry-Design-Revised-Updated-Briefs/dp/1616890363

Found it:
Geometry of Design, Revised and Updated (Design Briefs) Elam, Ki... https://www.amazon.com/dp/1616890363/ref=cm_sw_r_sms_awdo_t1_C4GcBb5B5X288

Handy little book on grid systems.

Apart from the landscape format, it sounds like Geometry of Design

Geometry of Design.

• Geometry of Design
  
• Graphic Design Manual: Principles and Practice