“…But you know it’s a leap year,” editorial cartoon, June 21, 1904 | Editorial Cartoons of J.N. Ding Darling
“Yes, Virginia, this is a leap year,” newspaper column, Feb. 29, 1968 | The Daily Iowan Historic Newspapers
“Leap year,” mixed media by Jill Erickson, 1987 | School of Art & Art History Graduate Archive