The Cambrian, Ordovician, and Silurian in Västergotland, Närke, Dalarna, and Jämtland, Central Sweden guide to excursions Nos A 23 [August 4 - 14] and C 18 [August 26 - September 5] 1960 - Thorslund, Per 1900-1981; Jaanusson, Valdar (Geological Survey of Sweden, 1960)