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LEGO Simple Machines for Kids with STEMtastic - San Antonio Charter Moms
The LEGO Technic Idea Book: Simple Machines: Isogawa, Yoshihito: 9781593272777: Amazon.com: Books
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Amazon.com: LEGO Education Simple Machines Set # 9689 : Toys & Games
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Amazon.com: LEGO Education DUPLO Early Simple Machines Set 9656, Mechanical Fun Educational Toy and STEAM Learning for Girls and Boys Ages 5 and up (102 Pieces) : Toys & Games