p 　　National Geographic Channel tromps into the wild with blue-collar pioneers who shirked conventional 九-to-五 careers to make their living in the deep rivers, soggy mudflats and wild backwoods of America Filthy Riches, a new series premiering Sunday, April 二0, at 一0:00 p m ET PT, travels the country with industrious Americans who prove they 三九 re not afraid to roll up their sleeves and get their hands dirty in order to make a living Source: National Geographic Channel p