"The Delta 0100 series, also Delta 100, 0300 or 300 series, was an American expendable launch system which conducted orbital launches between 1968 and 1972. It was a member of the Delta family of rockets, and the first to be designated using a four digit numerical code. Two variants were flown, individually designated Delta 0300 and Delta 0900.The Long Tank Thor, a stretched version of the Thor missile, was used as the first stage of the Delta 0100 series."@en . "Delta 0100 series"@en . "1973-11-06Z"^^ . . "1"^^ . "Retired" . "5"^^ . "4"^^ . . . "1972-07-23Z"^^ . . .