Extraction of Manganese from Georgia Umber Ore by a Sulfuric Acid-ferrous Sulfate Process (in Two Parts).: Countercurrent-decantation extraction and agglomeration of leached residue tests. 1

Ultrafine Grinding of Several Industrial Minerals by the Attrition-grinding Process: Issues 7641-7656

Preparation Characteristics of Coal from Tazewell County, Va: Issues 6281-6300

Factors Influencing the Incendivity of Permissible Explosives: Ammonium Nitrate and Carbonaceous Material, Issues 5861-5880

Stresses Induced Around Mine Development Workings by Undercutting and Caving, Climax Molybdenum Mining, Colorado (in Two Parts).: Strain and deformation measurement. 2

Method for Testing Rate of Gas Diffusion in Crude Oil by Periodic Measurements of Concentration Profiles: Issues 7357-7360

Multiple Zone Mining Plus Beneficiation of Western Phosphate Rock: A Cost Estimate and Comparison with Selective Mining, Issues 7501-7520

Detonation of a Flammable Cloud Following a Propane Pipeline Break: The December 9, 1970, Explosion in Port Hudson, Mo, Issues 7741-7760

Using Radiant Heat to Reduce Coal Filter-cake Moisture: Results of Pilot Plant Tests, Issues 5824-5832

Report of Investigations: no.7381 to date

Sulfur in Lignite: Form and Transformations on Thermal Treatment, Issues 5621-5640

Test Operation of a Pneumatic Vibrating-blade Planer in Phosphate and Coal: A Progress Report on Planer-mining Research, 1958-60, Issues 6121-6140

Fersmite: A Rare Calcium-columbate Mineral from Montana, Issues 5681-5700

Defluorination of Fluorspar: Preparation of Aluminum Fluoride from Siliceous Fluorspar, Issues 6021-6040

Calibration of a Rotating Piston Deadweight Gage by Means of a Mercury Column Less that 1 Meter High: Significance of Piston Constants and Their Applications, Issues 6821-6840

A Microscope System Using Automated Reflectance Scanning to Study Coal Components: Application to Analysis of Pyrite Distribution, Issues 7241-7260

Test Operation of a Pneumatic Vibrating-blade Planer: A Progress Report on Phosphate Mining Research, Issues 6861-6880

A One-step Operation for Recovery of Manganese as Chloride from Ores and Slags: 1966

Low-temperature Heat Capacities and Entropies at 298.15° of Sulfides of Arsenic, Germanium and Nickel: 1963

Simulated Nuclear Reactor System for High-temperature Process Heat: 1,000-hour Demonstration Run at 2,500 F., Issues 5881-5900