A teenager with a previous conviction for making a pipe bomb in his Nazi memorabilia-filled bedroom has admitted a terror offence.
At Leeds Crown Court, the 19-year-old admitted possessing a document for terrorist purposes.
Coulson, of Mexborough, South Yorkshire, was remanded in custody and is due to be sentenced on Thursday.
Coulson admitted possessing The Big Book Of Mischief between 3 and 20 January.
The court was told the document contained information of a kind likely to be useful to a person looking to commit an act of terrorism.
During his previous trial, Coulson, who lived in Bradford and was 17 at the time, was not named after he was granted anonymity due to his age.
Coulson, who praised the killer of MP Jo Cox, was arrested after he put a photo of the pipe bomb online.
He was also a member of the "secretive neo-Nazi" organisation National Action, which is now a proscribed terror group, the court was told.
In the trial early last year, Coulson was found guilty of making explosives but acquitted of the preparation of terrorist acts.
The teenager told the court he had never intended to use the pipe bomb, and was given a three-year youth rehabilitation order.
The pipe bomb was found in a drawer in his bedroom after police were alerted through suspicious messages on Snapchat.
One of the messages was a cartoon-like image of a mosque being blown up along with the words: "It's time to enact retribution upon the Muslim filth."
The trial also heard the defendant's "perverted" views led to him celebrating the murder of Labour MP Jo Cox and proclaiming her murderer, Thomas Mair, as a hero.