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- [35] STATUS-REPORT ON SUBTERRANEAN COAL-GASIFICATION TECHNOLOGY ERDOL & KOHLE ERDGAS PETROCHEMIE, 1980, 33 (04): : 177 - 177
- [37] THE CURRENT STATUS OF THE GOVERNMENT RESEARCH REPORT IN THE UNITED-STATES OF AMERICA UNESCO BULLETIN FOR LIBRARIES, 1959, 13 (8-9): : 187 - 196