@misc{1165266, author = {C A Douglas}, title = {Methods of modifying the transmissometer system to permit its use during periods of very low runway visual range:}, year = {1964}, month = {1964-01-01 05:01:00}, publisher = {, National Institute of Standards and Technology, Gaithersburg, MD}, doi = {https://doi.org/10.6028/NBS.RPT.8188}, language = {en}, }