106 THE U. S. GEOLOGICAL SURVEY 



Classification of Activities 



i. Topographic Survey 



2. Geologic Survey 



3. Investigation of Mineral Resources 



1. Metalliferous Deposits 



2. Non-metalliferous Deposits 



3. Coal 



4. Oil and gas 



4. Investigation of Water Resources 



5. Classification of Public Lands 



6. Compilation of Statistics 



1. Mineral Resources 



2. Production of Mines and Quarries 



3. Imports and Exports 



7. Scientific Research 



1. Chemical 



2. Physical 



3. Geological , 



4. Methods of Flood Prevention and Drainage 



5. Stream Pollution and Remedial Methods 



8. Publication 



1. Topographic Maps 



2. Geologic Maps and Descriptive Text 



3. Description of the Mineral Resources of the United 



States 



4. Papers on Geological and Related Subjects 



5. Papers on Water Resources 



6. Miscellaneous 



9. Operation of Engraving and Printing Plant 



