An open air school in NYC circa 1900.
An open air school in Rochester, New York during rest period in 1912.
Children in the snow outside of an open-air school in Rochester, New York sometime between 1900 and 1920.
Children in a fresh air class with open windows on cots and wrapped in blankets in 1911.
A student in a "sitting-out bag" sitting outdoors at a desk, reading, between 1900 and 1920.
Students in a food line at a Manhattan public school between 1900 and 1920 before lunch.
An open-window classroom at Riverdale Country School in NYC between 1900 and 1920.