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acid gases Allen and Zies ammonia ammonium amount of fluorine analysis arsenic sulfide Basinger boric acid Brooks Falls Bull calcium carbonate cent coast concentration contained copper deposited determined elytra emanations Europe and Siberia Excursion Inlet fact Fenner ferric chloride filtrate fluorine fluorine content formed fumarolic Geol grams halides hydrochloric acid hydrofluoric acid hydrogen sulfide incrustations insoluble iron Jour July June Katmai Katmai Series Kenai Peninsula Kodiak Labrador Lakes lava magnetite Mann metallic constituents method molybdenum Mosc Mount Pavlof National Geographic Society northern Europe Novarupta obtained oxide phase phosphate precipitated present pumice reagents region relatively residue rhyolite rock Rocky Mountains sample siliceous small amount sodium soluble solution southeastern Alaska Spec species specimen from Brooks specimens from Katmai specimens from Kodiak specimens from Savonoski spectrum steam and acid substances sulfates surface temperature thallium Thousand Smokes tion titanium Treadwell-Hall Unalaska Island vent volatile volcanic Washington zinc