Jeff Barger

Maestro (Ayudantes Comunitarios (Community Helpers))

Constructor (Ayudantes Comunitarios (Community Helpers))

Cartero (Ayudantes Comunitarios (Community Helpers))

Bombero (Ayudantes Comunitarios (Community Helpers))

Oficial de Policía, Grades K - 2 (Ayudantes Comunitarios (Community Helpers))

Oficial de Policía (Ayudantes Comunitarios (Community Helpers))

Teacher (Community Helpers)

Veterinarian (Community Helpers)

Doctor (Ayudantes Comunitarios (Community Helpers)) (Community Helpers)

Police Officer (Community Helpers)

Grocer (Community Helpers)

Mail Carrier (Community Helpers)

Firefighter (Community Helpers)

Builder (Community Helpers)

Simple Machines Pulley (Simple Machines)

Simple Machines Wheel and Axle (Simple Machines)

Simple Machines Wedge (Simple Machines)

Simple Machines Inclined Plane (Simple Machines)

Simple Machines Screw (Simple Machines)

Simple Machines Lever (Simple Machines)

How to Make a Terrarium (Step-By-Step Projects)

How to Build Box Cars and Trucks (Step-By-Step Projects)

Go-Karts (How It Works)

Dropping in on Washington DC (Dropping in on)