Hydrology of the Tertiary-Cretaceous aquifer system in the vicinity of Fort Rucker Aviation Center, Alabama /

Mode of access: Internet.

Hydrology of area 52, Rocky Mountain coal province Wyoming, Colorado, Idaho, and Utah /

Mode of access: Internet.

Hydrology of area 41, western region, interior coal province, Oklahoma and Arkansas /

Mode of access: Internet.

Hydrology of area 48, northern Great Plains and Rocky Mountain coal provinces, Montana and Wyoming /

Mode of access: Internet.

Hydrology of area 11, Eastern Coal Province, Ohio, Kentucky, and West Virginia /

Mode of access: Internet.