Two Drawings of "Madler's Square"

"The unusual angular-shaped enclosure that appeared in many early books about the Moon. It is a remarkable geometrically regular square-shaped enclosure foreshortened into a losenge shape immediately west of the crater Fontenelle, to the north-east of Plato, on the north 'shore' of the Mare Frigoris." - Page 50, Extraterrestrial Archaelogy.

The Lunascan is studying recent releases of Lunar Orbiter images to shed more light on this area of the Moon.