“…Nitrogen data on magnetic and non an excess of some other volatiles, e.g., T1, magnetic fractions separated with a hand magnet Bi, In (LAUL et al, 1970a(LAUL et al, , b, 1972, RIEDER and are presented in Table 8. Generally the ratio WANKE, 1969, MULLER andZAHRINGER, 1966).…”