@misc{1191201, author = {Margaret W Chapman}, title = {Circular of the Bureau of Standards no. 575::bibliography on nitrogen 15}, year = {1956}, month = {1956-01-01 05:01:00}, publisher = {, National Institute of Standards and Technology, Gaithersburg, MD}, doi = {https://doi.org/10.6028/NBS.CIRC.575}, language = {en}, }