ORIGIN OF NITROGEN IN COALS

[1] [Anonymous], BEITR BIOL PFLANZ

[2] BARTLETT J. B., 1939, Iowa State College Journal of Science, V14, P11

[3] BARTLETT JB, 1938, SOIL SCI SOC AM P, V3, P210

[4] ORCEIN UND LACKMUS [J]. ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, 1961, 73 (20) : 665 - &

[5] BORNER H, 1955, NATURWISSENSCHAFTEN, V42, P583

[6] BORNER H, 1956, NATURWISSENSCHAFTEN, V42, P129

[7] Broadbent F. E., 1954, P SOIL SCI SOC AM, V18, P165

[8] BRUGES NA, 1963, NATURE, V199, P696

[9] BRUGES NA, 1964, GEOCHIM COSMOCHIM AC, V28, P1547

[10] BUTENANDT A, 1960, LIEBIGS ANN CHEM, V632, P143

[1] [Anonymous], BEITR BIOL PFLANZ

[2] BARTLETT J. B., 1939, Iowa State College Journal of Science, V14, P11

[3] BARTLETT JB, 1938, SOIL SCI SOC AM P, V3, P210

[4] ORCEIN UND LACKMUS [J]. ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, 1961, 73 (20) : 665 - &

[5] BORNER H, 1955, NATURWISSENSCHAFTEN, V42, P583

[6] BORNER H, 1956, NATURWISSENSCHAFTEN, V42, P129

[7] Broadbent F. E., 1954, P SOIL SCI SOC AM, V18, P165

[8] BRUGES NA, 1963, NATURE, V199, P696

[9] BRUGES NA, 1964, GEOCHIM COSMOCHIM AC, V28, P1547

[10] BUTENANDT A, 1960, LIEBIGS ANN CHEM, V632, P143