Moon Zoo was a project to study the lunar surface in unprecedented detail, by asking volunteers to identify craters and boulders in millions of images from NASA's Lunar Reconnaissance Orbiter (LRO).
The Zooniverse makes citizen science websites that let everyone be part of real research online. In 2010 they created Moon Zoo to allow volunteers help map the surface of the Moon.
The project was archived in March 2016.
Moon Zoo is one of many astronomy projects on the Zooniverse, and is very similar to Planet Four, which involves exploring the surface of Mars.
So far Moon Zoo has produced one publication - Bugiolacchi et al, 2016
You can download and explore the data used in this publication at data.moonzoo.org