caption: The image shows an old book with a picture of a man and a woman dancing, surrounded by a group of people. The book is titled "La Polka Danseuse" and is likely a collection of folk dance from Philadelphia. The man and woman are dressed in traditional Polish clothing, with the man wearing a white shirt and a black hat, and the woman wearing a colorful dress with a pattern of flowers. The people in the picture are smiling and appear to be having a great time.