- Buku AudioA PulleyDavid Armentrout
- Buku AudioHistoric Sites & MonumentsDavid Armentrout
- Buku AudioAn Inclined PlaneDavid Armentrout
- Buku AudioA LeverDavid Armentrout
- Buku AudioA WedgeDavid Armentrout
- Buku AudioA WheelDavid Armentrout
- Buku AudioA ScrewDavid Armentrout
- Buku AudioDirt BikesDavid Armentrout
- Buku AudioHistoric & Famous CitiesDavid Armentrout
- Buku AudioStunts, Tricks, and JumpsDavid Armentrout
- Buku AudioThe Fire DepartmentDavid Armentrout
- Buku AudioThe Post OfficeDavid Armentrout