April 6 in history, these intelligence were sent to the US president

情报历史上的4月6日，这些情报被递交给时任美国总统

Intelligence History on 1962 April 6
Intelligence History on 1963 April 6
Intelligence History on 1964 April 6
Intelligence History on 1965 April 6
Intelligence History on 1966 April 6
Intelligence History on 1967 April 6
Intelligence History on 1968 April 6
Intelligence History on 1970 April 6
Intelligence History on 1971 April 6
Intelligence History on 1972 April 6
Intelligence History on 1973 April 6
Intelligence History on 1974 April 6
Intelligence History on 1976 April 6