An RF (Radio Frequency) Absorber for Interference Suppression Technical Memorandum

This sub-series contains materials related to the research projects Donald Heirman assisted with or led from the late 1960s to the 1970s. It includes work with the United States Navy on Project Sanguine and the Distant Early Warning Line, completing low frequency inductive interference surveys on telephone lines, and establishing an RF field survey program. Materials include technical memorandums, work reports, and correspondence.