Abdullah, Maher Najm, Abood, Mohammed Rashid, AND Hussain, Amera Ismael. " The suitability of Sinjar and Pila spi rocks for building and as railway ballast stone for the Bazian anticline fold in the Sulaymaniyah governorate" Tikrit Journal of Pure Science [Online], Volume 27 Number 1 (16 January 2022)