- AudiobookA PulleyDavid Armentrout
- AudiobookHistoric Sites & MonumentsDavid Armentrout
- AudiobookAn Inclined PlaneDavid Armentrout
- AudiobookA LeverDavid Armentrout
- AudiobookA WheelDavid Armentrout
- AudiobookA WedgeDavid Armentrout
- AudiobookA ScrewDavid Armentrout
- AudiobookDirt BikesDavid Armentrout
- AudiobookHistoric & Famous CitiesDavid Armentrout
- AudiobookStunts, Tricks, and JumpsDavid Armentrout