Boerboom, T. J. (1989). Tourmaline in early Proterozoic metasedimentary rocks near Philbrook, Northeastern Todd County, Central Minnesota.
Chicago-Zitierstil (17. Ausg.)Boerboom, Terrence J. Tourmaline in Early Proterozoic Metasedimentary Rocks Near Philbrook, Northeastern Todd County, Central Minnesota. Saint Paul, 1989.
MLA-Zitierstil (9. Ausg.)Boerboom, Terrence J. Tourmaline in Early Proterozoic Metasedimentary Rocks Near Philbrook, Northeastern Todd County, Central Minnesota. 1989.
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