@misc{1157191, author = {J W Wright}, title = {Analysis of ionospheric vertical soundings for electron density profile data. III, Procedures for obtaining monthly summary virtual height curves for N (h) analysis (composite virtual height curves):}, year = {1962}, month = {1962-01-01 05:01:00}, publisher = {, National Institute of Standards and Technology, Gaithersburg, MD}, doi = {https://doi.org/10.6028/NBS.TN.146}, language = {en}, }