Gibbs, Allan Seismic-reflection study of the Precambrian crust of central Minnesota bibliogr. p. 294 ISSN: 00167606 Subjects--Topical Terms: GéophysiqueSismique réflexionAntécambrienCro–te terrestreArchéenCeinture roche verteGraniteGneiss Subjects--Index Terms: Etats Unis Minnesota