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美国政府科技报告
>Investigation of radar echoes from the moon and planets using methods and data from earth radar-return studies semiannual status report, 1 nov. 1965 - 30 apr. 1966
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Investigation of radar echoes from the moon and planets using methods and data from earth radar-return studies semiannual status report, 1 nov. 1965 - 30 apr. 1966