1. Vergleichende Petrographie oolithischer Eisenerze Author/Creator: Berg, Georg 1876-1946. (Georg Ernst Wilhelm) Publication/Creation: Berlin : Reichsamt für Bodenforschung, 1944 Resource Type: Book Access & Availability: Loading
2. The Vermilion iron-bearing district of Minnesota, with an atlas Author/Creator: Clements, J. Morgan 1869- (Julius Morgan) Publication/Creation: Washington : Gov't Print. Off, 1903 Resource Type: Map Access & Availability: Loading