@misc{1183146, author = {Belinda L Collins and Brian C Pierman}, title = {Evaluation of safety symbols:}, year = {1979}, month = {1979-01-01 05:01:00}, publisher = {, National Institute of Standards and Technology, Gaithersburg, MD}, doi = {https://doi.org/10.6028/NBS.IR.79-1760}, language = {en}, }