This book, "Open air crusaders a report of the Elizabeth McCormick open air school, together with a general account of open air school work in Chicago and a chapter on school ventilation. 1", by Sherman Colver Kingsley, is a replication of a book originally published before 1910. 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.