Mules - Stubborn beasts Mules - Symbols of stubbornness Mules - Obstinate ones Mules - Sterile hybrids Mules - Drug smugglers Mules - Stubborn critters Mules - Equine hybrids Mules - Open-back shoes Mules - Backless slippers Mules - Slippers of sorts Mules - Contraband carriers Mules - Lounging wear Mules - Stubborn creatures Mules - Stubborn sorts Mules - 'two __ for sister sara' Mules - Burros' relatives Mules - Like 18-, 24-, 34-, 44-, 53-, and 64-across, they carry 66-across Mules - Pack animals Mules - Cart pullers Mules - Hybrid pack animals Mules - Stubborn animals Mules - They go on foot, though one goes on their back, yet there's no back to them Mules - Crosses on foot or on the hoof Mules - Hybrid offsprings of a male donkey and a female horse Mules - Stubborn horse-donkey animaly Mules - Offsprings of male donkey and female horse Mules - Offspring of male donkeys and female horses Mules - Footwear for pack animals Mules - Draft choices Mules - Some slippers Mules - Lounging footwear Mules - Slippers for the stubborn? Mules - Stubborn ones Mules - Animals given quarter in hovel, with hindsight Mules - See 26-across Mules - Mixed up leads for the french drug smugglers Mules - Beasts of burden Mules - Hybrid carriers Mules - Canyon transports Mules - Pack beasts Mules - Some farm beasts Mules - Gov't and waits' "variations" Mules - Al stewart might travel with "three" Mules - Given to sulking Mules - Grand canyon rentals Mules - Stubborn equines Mules - Plow pullers