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Henry Erni

    Mineralogy Simplified: Easy Methods of Identifying Minerals, Including Ores, by Means of the Blow-Pipe, by Flame Reactions, by Humid Chemical
    Mineralogy Simplified: A Short Method Of Determining And Classifying Minerals, By Means Of Simple Chemical Experiments In The Dry And Wet Way
    Coal Oil and Petroleum: Their Origin, History, Geology, and Chemistry
    Mineralogy Simplified: Easy Methods Of Identifying Minerals, Including Ores, By Means Of The Blowpipe, By Flame Reactions, By The Spectroscop