|
I 53.20:98
|
Evaluation, coal, depreciation rates |
1 |
|
I 53.20:99
|
Coal, reserves, electric generating plant : coal, reserves, synthetic fuel plant : electric generating plant, coal reserves required : synthetic fuel plan, coal reserves required |
1 |
|
I 53.20:102
|
Coal data |
1 |
|
I 53.20:103
|
Coal, synthetic fuels, feasibility : synthetic fuels, from coal, feasibility |
1 |
|
I 53.20:104
|
Acid mine water, acid mine drainage |
1 |
|
I 53.20:105
|
Coal, chemicals from : chemicals from coal |
1 |
|
I 53.20:106
|
Coal |
1 |
|
I 53.20:107
|
Surface mines, planning, design, engineering : open pit mines, planning, design, engineering : strip mines, planning, design, engineering |
1 |
|
I 53.20:108
|
Coal, bituminous, information : coal, bituminous, statistics : coal, bituminous, data |
1 |
|
I 53.20:109
|
Coal, operating mines |
1 |
|
I 53.20:110
|
Coal, value |
1 |
|
I 53.20:112
|
Oil-impregnated sandstone, Uintah Basin, Utah |
1 |
|
I 53.20:113
|
Mineral valuation, solid minerals : selected references |
1 |
|
I 53.20:114
|
Industrial minerals, non-metallic minerals |
1 |
|
I 53.20:115
|
Industrial minerals, non-metallic minerals, (revision of earlier technical note) |
1 |
|
I 53.20:116
|
Industrial minerals, talc, feldspar, fluorspar and cement raw materials, evaluation : non-metallic minerals, talc, feldspar, fluorspar and cement raw materials, evaluation : talc deposits, evaluation : feldspar deposits, evaluation : cement raw materials, evaluation : fluorspar deposits, evaluation |
1 |
|
I 53.20:117
|
Clays, general publications |
1 |
|
I 53.20:118
|
Mining claims, non-mining use, injunction |
1 |
|
I 53.20:119
|
Milling costs |
1 |
|
I 53.20:120
|
Clays, bentonite : bentonite |
1 |