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APR 28 1943

CONTENTS.

The purpose of land classification__

Development of the Survey's organization for land classification_.

History and legal basis for land classification____

Introduction___.

Land laws____

General divisions.

Public-land laws

Agricultural-land laws.

Purpose

Homesteads --

Forest homesteads.

Enlarged homesteads

Desert land....

Page.

7

11

18

18

20

20

20

20

20

21

21

22

History and legal basis for land classification-Continued.

Agencies and methods of classification-Continued.

Classification by the Geological Survey-Continued.

Water-power sites..

Reservoir sites____

Public water reserves_

Withdrawal acts---

Separation acts___

Desirable new legislation_.

Classification of mineral lands___

Field methods___

Development.

Detailed survey-

Page.

41

42

42

43

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46

50

50

50

53

53

54

Methods used when a topographic base is available--

Methods used when a base map must be prepared__.

Methods followed when the Land Office survey affords a

base map.

Reconnaissance survey-.

Public-land surveys---

58

60

61

Classification of mineral lands-Continued.

Coal lands-Continued.

Field work on coal lands-Continued.

Attitude and depth of the coal..

Quality of the coal-----

Preparation of material___

Procedure in classification and valuation_

Progress in classification and valuation_

Oil and gas lands_____

Occurrence of oil and gas----

Classification of oil and gas land__

Phosphate lands____.

Use of phosphate----

Lands containing phosphate..

Phosphate reserves..

Florida reserves_.

Western reserves..

Summary of phosphate situation.

Classification of phosphate lands__

Factors involved

Principles controlling classification.

Regulations

Progress in classification___.

Lands bearing potash and related salines_

Geologic occurrence of the deposits--

Page.

105

105

108

108

111

111

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117

123

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128

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129

130

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134