The North Block of the Old Jewish Cemetery of Mielec on ul. Jadernych is just four tombstones lying on the ground around a tree. To the best of our knowledge, these four stones were part of the large discovery of Jewish tombstones underneath the Rynek during renovations in 2018.
Prof. Leszek Hondo at Jagellonian University in Kraków is publishing a book (soon) of the Jadernych cemetery which will include these stones. Meanwhile here are a few images.
The full collection of photos were uploaded to the JewishGen Online Worldwide Burial Registry (JOWBR) by Scott Genzer in 2018.