1. A probable meteorite crater of Precambrian age at Holleford, Ontario;Beals;Pub. Dom. Obs., Ottawa,1960
2. Evidence suggesting a meteorite impact origin for Lac Couture;Beals;Quebec,1964
3. Cryptovolcanic structures in the United States;Bucher;Internat. Geol. Cong.,1935
4. Cryptoexplosion structures caused from without or from within the Earth;Bucher;Am. J. Sci.,1963