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Books about Iwonski:
Iwonski in Texas: Painter and Citizen by James Patrick McGuire (1976)
Iwonski In Texas: Painter & Citizen- Text By James Patrick McGuire by Carl G. Von Iwonski (1976)
Wiki information Iwonski:
Carl G. von Iwonski was a painter born in Germany who became a naturalized American citizen. He was artistically active in San Antonio and New Braunfels, and best known for his portraits of Texas pioneers.