SeveralĀ e-books are available on the LPI library webpage, including:

Lunar Stratigraphy and Sedimentology (1976) by John Lindsay
Planetary Science: A Lunar Perspective (1982) by Stuart Ross Taylor
Origin of the Moon (1986) edited by W. K. Hartmann, R. J. Phillips and G. J. Taylor
Traces of Catastrophe (1998) by Bevan French
Guidebook to the Geology of Barringer Meteor Crater, Arizona (a.k.a. Meteor Crater) (2007) by David Kring