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Papers of Grote Reber > Ionosphere Series > Critical Frequency Survey Unit

Collection Items

Critical Frequency Survey: Africa, South and Central America

Start Date: 1944-01

Critical Frequency Survey: Australia

Start Date: 1952-01

Critical Frequency Survey: Northern Hemisphere, North America

Start Date: 1944-01

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Papers of Grote Reber
- Papers of Grote Reber > Ionosphere Series
  - Papers of Grote Reber > Ionosphere Series > Critical Frequency Survey Unit