Smithsonian Report. 1935. — Wright 



F. G. Pease, Mount Wilson Observatory, Sept. 1.5. 1919. 



Northeast Portion of Moons Surface. 



Mare Imbrium occupies the central part of this view. It is 800 miles across and is bordered by high 

 mountains of strange aspect. Observe the diversity in sizes and characteristics of the circular features 

 or craters. 



