 | | Report (issue) | | .. - ._-.- ---------- BULLETIN NO.6. '£Hl~ IRON ORES 0]' MINNESOTA, THEIR GEOLOGY, DISCOVERY,... ORIGIN, AND DEVELOPMENT, COMPARISON OTHER IRON WITH QUALITIES THOSE AND OF DISTRICTS, 'VITH...extra edition published at their own expense,] THE IRON ORES OF MINNESOTA. CONTENTS. Pa,gc. Preface ....The carbonated iron group .......................... . (4). The gabbro-titanic· iron group ............the crystalline iron ores of Minnesota .. . (6). Comparisons wiLh Michigan and Wisconsin.............. |
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