athol ith , ▁published ▁by ▁the ▁American ▁Institute ▁of ▁M ining ▁Engine ers . ▁" T ob acco ▁Root " ▁appears ▁in ▁most ▁subsequent ▁publications , ▁including ▁Mont ana ▁Bureau ▁of ▁M ines ▁and ▁Ge ology ▁reports ▁( at ▁least ▁since ▁ 1 9 3 3 ), ▁National ▁Forest ▁Maps ▁( since ▁ 1 9 3 8 ), ▁and ▁the ▁Official ▁Mont ana ▁Highway ▁Maps . ▁ ▁However , ▁a ▁map ▁in ▁F enn eman ' s ▁Phys i ography ▁of ▁Western ▁United ▁States ▁( 1 9 3 1 ) ▁shows ▁a ▁long ▁Jefferson ▁Range ▁to ▁include ▁what ▁is ▁now ▁called ▁the ▁Tob acco ▁Ro ots ▁plus ▁the ▁Gra vel ly ▁Range . ▁O il ▁Company ▁highway ▁maps ▁from ▁the ▁late ▁ 1 9 6 0 s ▁and ▁early ▁ 1 9 7 0 s ▁show ▁" T ob acco ▁Root ▁Mountains " ▁in ▁the ▁north , ▁and ▁" J eff erson ▁Range " ▁in ▁the ▁south ▁( n orth west ▁of ▁En nis ▁and ▁north ▁of ▁Virginia ▁City ). ▁Pre lim inary ▁top ographic ▁maps ▁of ▁the ▁area ▁( B ureau ▁of ▁Rec lam ation , ▁Missouri ▁Bas in ▁Project ) ▁from ▁ 1 9 4 7 - 4 8 ▁show ▁Jefferson ▁Range , ▁but ▁on ▁the ▁ 1 9 5 0 ▁ 1 5 - min ute ▁sheet ▁( H arrison ▁Qu ad ) ▁the ▁identical ▁top ography ▁is ▁l abeled ▁" T ob acco ▁Root ▁Mountains " ▁in ▁the ▁same ▁place ▁as ▁" J eff erson ▁Range " ▁on ▁the