Ground-water levels in the United States, 1963-67

Eitemau Tebyg

• Ground-water levels in the United States, 1974 : southeastern states
  gan: United States. Geological Survey
  Cyhoeddwyd: (1977)
• Ground-water levels in the United States, 1966-70 : Southwestern states
  gan: United States. Geological Survey
  Cyhoeddwyd: (1972)
• Ground-water levels in the United States, 1961-65 : northwestern states
  gan: United States. Geological Survey
  Cyhoeddwyd: (1968)
• Ground-water levels in the United States, 1964-68 : southeastern states
  gan: United States. Geological Survey
  Cyhoeddwyd: (1971)
• Ground-water levels in the United States, 1971-74 : northwestern states
  gan: United States. Geological Survey
  Cyhoeddwyd: (1977)