The back of the original envelope containing Irina Sendler's 1942 letter. The return address is Sendler's home in Warsaw.

A Polish stamp honoring Irina Sendler, issued in 2018, ten years after her death.

A Polish coin commemorating Irina Sendler, issued in 2009 as part of a series called "Poles Who Saved Jews."

The newspaper obituary for Irina Sendler, who passed away in 2008.

An original, handwritten, six-page letter from Irena Sendler — with its original envelope. Postmarked April 21 at Warsaw, Poland, the cover is franked with two 1941 Mi-75 12 Groschen Deutsches Reich Generalgouvernement Nazi occupation stamps. The letter was authenticated by Holocaust experts and then translated by my friend Mieczyslaw.

The envelope from a letter written by Irena Sendler in 1942.

An original, handwritten, six-page letter from Irena Sendler — with its original envelope. The letter was authenticated by Holocaust experts and then translated by my friend Mieczyslaw.

An original, handwritten, six-page letter from Irena Sendler — with its original envelope. The letter was authenticated by Holocaust experts and then translated by my friend Mieczyslaw.