. . . . . . . . "Concentrating ores by flotation"@en . "Concentrating ores by flotation; being a description and history of a recent metallurgical development, together with a summary of patents and litigation"@en . "Concentrating ores by flotation, being a description and history of a recent metallurgical development, together with a summary of patents and litigation" . "Concentrating ores by flotation being a description and history of a recent metallurgical development, together with a summary of patents and litigation"@en . . "Concentrating ores by flotation : being a description and history of a recent metallurgical development, together with a summary of patents and litigation" . . . . . . "Concentrating ores by flotation : being a description and history of a recent metallurgical development, together with a summary of patents and litigation"@en . . . . . . . . . . "Concentrating Ores by Flotation: being a description and history of a recent metallurgical development, together with a summary of patents and litigation"@en . "Concentrating ores by flotation : being a description and hisory of a recent metallurgical development, together with a summary of patents and litigation$bby Theodore J. Hoover" . "Flotation." . .