Books by Lewis and Clark County Water Quality Protection District (Mont.):
Books in the extended shelves:
![[X-Info]](https://onlinebooks.library.upenn.edu/infouc.gif)
Lewis and Clark County Water Quality Protection District (Mont.): Hydrology of Helena area bedrock, west-central Montana, 1993-98 (U.S. Dept. of the Interior, U.S. Geological Survey ;, 2000), also by Joanna N. Thamke, Mitchell W. Reynolds, and Geological Survey (U.S.) (page images at HathiTrust)
Find more by Lewis and Clark County Water Quality Protection District (Mont.) at your library, or elsewhere.