A thief stole the doors off mausoleums and made off with dozens of air vents from a historic Jewish cemetery on the border of Brooklyn and Queens, according to cops.

Authorities said the missing mausoleum materials were valued at $30,000.

A worker at Beth Olam Jewish Cemetery first noticed the seven missing doors Sunday morning at 6, according to police. They later found that someone had taken 14 doors and 75 air vents from seven separate mausoleums and reported the crime at 2:45 p.m.

Cops said the theft at the cemetery on Cypress Hills Street happened sometime between Friday afternoon and Sunday morning.

The NYPD was investigating the grand larceny Sunday.