S. S. U. 503 of the U. S. army ambulance service with the French army This book, "S. S. U. 503 of the U. S. army ambulance service", by Glenn W. Clark, is a replication of a book originally published before 1920. It has been restored by human beings, page by page, so that you may enjoy it in a form as close to the original as possible. This book was created using print-on-demand technology. Thank you for supporting classic literature.