De Lacy, W. W. (. W. (1878). Map of the territory of Montana with portions of the adjoining territories / compiled and drawn by W.W. De Lacy, civil engineer & surveyor, Helena, M.T (2nd ed., corr. & improved.). G.W. & C.B. Colton.MLA Citation
De Lacy, W. W. (Walter Washington). Map of the Territory of Montana With Portions of the Adjoining Territories / Compiled and Drawn By W.W. De Lacy, Civil Engineer & Surveyor, Helena, M.T. 2nd ed., corr. & improved. G.W. & C.B. Colton, 1878.