Geochemical Characterization of Paleoproterozoic Volcanic and Hypabyssal Igneous Rocks, East-central Minnesota

---

Bulletin

---

Report of Investigations

---

Dissertation Abstracts International

---

Implications for Early Proterozoic Tectonics and the Origin of Continental Flood Basalts, Based on Combined Trace Element and Neodymium/strontium Isotopic Studies of Mafic Igneous Rocks of the Penokean Lake Superior Belt, Minnesota, Wisconsin and Michigan

---

American Doctoral Dissertations

---

Petroleum Abstracts. Literature and Patents

---

Bibliography and Index of Geology

---

Register of Doctoral Degrees Conferred by the University of Minnesota

---

Petroleum Abstracts

---