9781593272777 : The LEGO Technic Idea Book: Simple Machines
The LEGO Technic Idea Books Inspire Enthusiasts to Design, Invent, and Build--New Series from No Starch Press: Three-Volume, Four-Color, LEGO Picture Book Series
9781593272777 : The LEGO Technic Idea Book: Simple Machines
9781593272777 : The LEGO Technic Idea Book: Simple Machines