@misc{1181381, author = {John P Wakefield}, title = {Addendum to earth terminal measurement system maintenance manual:}, year = {1981}, month = {1981-01-01 05:01:00}, publisher = {, National Institute of Standards and Technology, Gaithersburg, MD}, doi = {https://doi.org/10.6028/NBS.IR.81-1641}, language = {en}, }