"Approximate quantitative microscopy of pulverized ores including the use of the camera lucida"@en . . . . . . . . . "Approximate quantitative microscopy of pulverized ores, including the use of the camera lucida"@en . . . . . . "Approximate Quantitative Microscopy of Pulverized Ores, including the use of the camera lucida"@en . . . . . . "Quantitative microscopy of pulverized ores"@en . . "Approximate quantitative microscopy of pulverized ores : including the use of the camera lucida" . . . .