Branch of Mineral Classification handbook of instructions

"This handbook of instruction for field geologists of the Branch of Mineral Classification, Conservation Division, has been prepared with the object of effecting uniform methods of land classification to provide an appropriate basis for leasing and development of the minerals specified in the Act of February 25, 1920 (41 Stat. 437), as amended ́Œ This handbook is not intended to be a manual of surveying instructions or map-making techniques"--Page iv.