510, xii p.; ill.; 28 cm.
Colorado state mining directory, 1898: buyer's guide to representative mining machinery and supply houses of America ; Mineral resources of La Plata county; Mineral resources of La Plata county
Dunbar, A. R. (Archibald Ranulph); Lakes, Arthur, 1844-1917; Western Mining Directory Co. Pub. (Denver, Colo.), Denver (Colo.); Western Mining Directory Co. Pub., 1898