A collection of rare documents belonging to Oskar Schindler, including original construction plans to build facilities intended to house Jews during the war, will be auctioned off later this month.

The lot, offered by RR Auction, will also include letters in which Schindler negotiated to keep open his factory in Krakow, Poland, even after Amon Goeth, the head of the nearby Plaszow concentration camp, ordered the closure of all factories not directly involved in the war effort.

"This is the first document I have seen verifying this move and it is quite important because I thought it took him much longer to get such permission,” said David M. Crowe, a Holocaust historian and author. “Most importantly, if Oskar had not gotten such permission, there would have been no Schindler’s List.”

Read more at the Forward.