LOW FREQUENCY SWEEP GROUP HEIGHT AND POLARIZATION RECORDS Open PDF Document Details Document Type Technical Report Publication Date Feb 01, 1963 Accession Number AD0401184 Entities People J. D. Hardy Organizations Pennsylvania State University Tags DTIC Thesaurus Topics Abstracts Air Force Bibliographies Colorado Contracts Electrical Engineering Electromagnetic Wave Propagation Electron Density Engineering Frequency Government Procurement Intervals Ionosphere Parkinson'S Disease Standards United States Universities