A Study of Lunar Research Flights Vol. 1 by L. Reiffel- A declassified report from 1959 regarding setting off nuclear explosions on the moon.
NASA's GRAIL Creates Most Accurate Moon Gravity Map
"What this map tells us is that more than any other celestial body we know of, the moon wears its gravity field on its sleeve," said GRAIL Principal Investigator Maria Zuber of the Massachusetts Institute of Technology in Cambridge. "When we see a notable change in the gravity field, we can sync up this change with surface topography features such as craters, rilles or mountains."