(1976). Geological Survey Research 1976: A summary of recent significant scientific and economic results accompanied by a list of geologic and hydrologic investigations in progress and a report on the status of topographic mapping. U.S. Gov. Print. Off.
Chicago-Zitierstil (17. Ausg.)Geological Survey Research 1976: A Summary of Recent Significant Scientific and Economic Results Accompanied by a List of Geologic and Hydrologic Investigations in Progress and a Report on the Status of Topographic Mapping. Washington: U.S. Gov. Print. Off, 1976.
MLA-Zitierstil (9. Ausg.)Geological Survey Research 1976: A Summary of Recent Significant Scientific and Economic Results Accompanied by a List of Geologic and Hydrologic Investigations in Progress and a Report on the Status of Topographic Mapping. U.S. Gov. Print. Off, 1976.