David W. Briar

• Hydrogeology and aquifer sensitivity of the Bitterroot Valley, Ravalli County, Montana
• Hydrogeology of the Helena Valley-fill aquifer system, west-central Montana
• Hydrology of valley fill and potential for additional ground-water withdrawals along the north flank of the Little Rocky Mountains, Fort Belknap Indian Reservation, north-central Montana
• Lithologic logs of observation wells and test holes drilled in 1987 in valley fill along the north flank of the Little Rocky Mountains, Fort Belknap Indian Reservation, north-central Montana