This booklet was created from remittances Szmul Zygielbojm (Jewish-Polish socialist politician, leader of the Bund, and a member of the National Council of the Polish government in exile) 1942. His booklet, written in Angielski before his suicide in 1942 and titled "Stop Them Now. German Mass Murder of Jews in Poland", with a Foreword by Lord (Josiah) Wedgwood, was his final attempt to focus world attention on what was happening to Jews in Europe.
Very rare and unique now.

More infor about Szmul Zygielbojm - https://en.wikipedia.org/wiki/Szmul_Zygielbojm