Discovering the Cosmos with Small Spacecraft, by Brian Harvey, tells the history of the original American space program, Explorer. This is the longest continually running space program in the world and the book has been produced in time to celebrate the 60th anniversary of the first launch back in 1958.
Building Habitats on the Moon, by Dr. Haym Benaroya, looks at all of the hazards and environmental issues that will have to be taken into consideration if we are to build permanent, survivable habitats on the lunar surface, examining the problem from the point of view of a structural engineer. Both of these books are available now.