According to [1] the Grojanowski Report is available at the Jewish Historical Institute in Warsaw (copy in YVA, JM/2713), and it was also translated into Hebrew by Elisheva Shaul, "Taking of Testimony from the Forced Undertaker Jakob Grojanowski, Izbice-Kolo-Chelmno," Yalkut Moreshet 35 (April 1983), pp. 101-122.