@misc{1191081, author = {George Keinath}, title = {Circular of the Bureau of Standards no. 601::recorder survey- recording surfaces and marking methods}, year = {1959}, month = {1959-01-01 05:01:00}, publisher = {, National Institute of Standards and Technology, Gaithersburg, MD}, doi = {https://doi.org/10.6028/NBS.CIRC.601}, language = {en}, }