In 1974, radio sources were divided by Fanaroff and Riley into two classes, now known as Fanaroff and Riley Class I (FRI), and Class II (FRII).
Julia Roberts | Terry Riley | Julia Kristeva | Julia Child | James Whitcomb Riley | Julia Smith | Julia Ward Howe | Bridget Riley | Bob Riley | Julia Fischer | Julia Sweeney | Julia Ormond | Baba O'Riley | Julia Stiles | Julia Fordham | Julia Copus | Julia | Teddy Riley | Richard Riley | Raúl Juliá | Raul Julia | Pat Riley | Julia Foster | Julia Donaldson | Fort Riley | Christopher O'Riley | Riley | Paul Riley | Old Mother Riley | Mike Riley |
A further revision by Laing, Riley and Longair in 1983, called 3CRR or 3CR², included galaxies which were not detected in the original catalogue due to shortcomings of the original observations, but which otherwise meet the flux and declination limits.