Karol Rathaus Papers finding aids @ Queens College, New York (lists among other things available manuscripts and printed scores by Rathaus in their collection, and availability to researchers)
Miscellaneous information
His hometown was Austrian when he was born, though it is Polish now. Whether he should be listed as a Polish or Austrian composer should depend on other things than the current atlas location of his hometown, e.g. his self-identifications, family history, etc.
