This lot features two 8.5" x11" spiral-bound softcover books about aircraft construction written by Tony Bingelis and published by EAA Aviation Foundation (Oshkosh, WI). 

1. The Sportplane Builder: Aircraft Construction Methods (1995, 334 pages)

2. Firewall Forward: Engine Installation Methods (1992, 302 pages)

They're in acceptable condition due to orange highlighting to many pages. The covers show light wear. There are a few pencil marks to Firewall Forward's first page.