Alkaline rocks and mineral deposits of Southern Central, and Northern Sweden guide to excursion No C 27 - Eckermann, Harry von 1886-1969; Larsson, Walter 1907-1985; Norin, Erik 1895-1982; Gorbačev, Roland 1931-; Quensel, Percy Dudgeon 1881-1966 (Geological Survey of Sweden, 1960)