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Buy a gun. Love, mom

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Newtown shooter Adam Lanza’s mother planned to give him the last thing he needed for Christmas — another gun, it was revealed yesterday.

Nancy Lanza wrote her son a holiday card with a check inside that he was supposed to use to buy a firearm to add to the family’s vast collection.

The card came to light as a the entire inventory of objects found at the home was released by Connecticut authorities,

It included an arsenal of guns, ammo, swords and knives — as well as an NRA handbook — found when cops executed search warrants following the Dec. 14 massacre of 20 children and six staffers at the Sandy Hook Elementary School.

The trove included:

* A bolt-action Enfield Albion .323-caliber rifle, the Savage .22-caliber rifle he shot his mother with a .22-caliber Volcanic starter pistol and a BB gun.

* Roughly 1,600 rounds of ammunition from dozens of manufacturers and a pair of 20-round drum magazines for a 12-gauge shotgun.

nThree samurai swords — the largest with a 28-inch blade — a dozen knives, a bayonet and a 6-foot-10-inch pole with a spear on one end and a knife blade on the other.

nThree photos of a blood-soaked corpse covered in plastic.

* A newspaper clipping about a February 2008 massacre at Northern Illinois University in which five people were killed and 21 wounded.

nA Sony PlayStation, a copy of “Call of Duty” and other violent video games, along with an extensive array of computer equipment, including a hard drive Adam Lanza tried to destroy.

nJournals, “literature” and a number of drawings by Lanza, though their contents were not revealed, along with academic records and his report card from when he was a student at the Sandy Hook school.

* Several books, including “Look Me in the Eye: My Life with Asperger’s,” “Born on a Blue Day: Inside the Extraordinary Mind of an Autistic Savant,” and “The NRA Guide to the Basics of Pistol Shooting.”

Neighbors had said Nancy Lanza told them Adam had Asperger’s syndrome, a form of autism, although it’s unclear if he was ever diagnosed with the condition.

* A National Rifle Association certificate belonging to Adam Lanza, although the NRA said neither he nor his mother was a member.

The certificate was found in a duffel bag along with earplugs, eye protectors, binoculars and numerous paper targets.

Police also found paper targets in a file cabinet.

The revelations caused a fresh round of grief for the parents whose kids were slaughtered by Adam Lanza — and did nothing to explain why he went on his rampage.

“It’s getting harder. The shock is wearing off and reality is starting to sink in,” said distraught dad Mark Barden, whose son Daniel was killed at the school.

Barden said he tries not to think about Adam Lanza or his mother.

“I’m ready for the winter to be over,” said Nicole Hockley, whose son Dylan was killed. “Any more details that come out just continue to be painful. There’s nothing that’s going to bring Dylan back or anyone else that died that day.”

A witness, whose name was among several pieces of information redacted from the warrants, told cops that Adam was a “shut-in” and “avid gamer,” and that the school where he carried out his rampage was his “life.”

The weapons and ammunition — found in a gun safe in Adam’s bedroom, in closets and other areas of the home — were in addition to the four guns and hundreds of rounds of ammo he had with him during the attack.

“It is currently estimated that the time from when the shooter shot his way into the school until he took his own life was less than five minutes,” chief prosecutor Stephen Sedensky said in a statement.

Adam Lanza, he said, fired 154 rounds in five minutes from a Bushmaster military-style assault weapon in the 9:30 a.m. bloodbath before killing himself with a Glock 10mm handgun.

Cops found three fully loaded 30-round magazines on Lanza’s corpse and another six that were spent or partially spent inside the school.

Lanza, in military-style clothing and wearing a bulletproof vest, was also carrying a Sig Sauer 9mm and had a Saiga 12-gauge shotgun with two magazines holding 70 shells in the trunk of the Honda Civic he drove to the school, Sedensky said.

But that clearly wasn’t enough, as Nancy Lanza’s “holiday card” to her son had a Bank of America check for another weapon — listed as a “C138 (Firearm).”

Weapons experts said that was likely a typo because no such gun exists — and they believe it referred to the Czech-made CZ 38, a semiautomatic handgun that sells for about $450.

The documents also provide chilling details in matter-of-fact language of what first responders found when they entered the school.

“Numerous schoolchildren and school personnel were located deceased from apparent gunshot wounds in the first three classrooms located off the main hallway,” read one report.

“Investigators also located a . . . white male dressed in military style clothing, wearing a bulletproof vest, lying deceased on the floor in the middle classroom.”

State cops revealed many of the horrific details from their three-month investigation to the victims’ families on Wednesday so they wouldn’t be blindsided by yesterday’s disclosures.

The redacted warrants released by the state’s Judicial Branch had been sealed since December, at the request of prosecutors.