Space Odyssey
Brunier & Luminet, a large format hardback covering the first 20 years of space exploration, lots of big glossy photos

Space
Andrew Chaikin, a large format hardcover book, covering the start of the space race right up till the spaceshuttle, full of glossy photos.

Lunar Exploration
Paolo Ulivi, a great book for anyone interested in Lunar exploration dating from the 1960s right up to 2003.

Journey beyond Selene
Kluger. Fascinating stories of unmanned space probes beyond the moon. Hardback, hard to put down, and reads like a novel.

Jupiter Odyssey (the story of NASA's Galileo mission)
David Harland, discusses previous Jupiter missions, what was involved in designing Galileo and the results it found.

Apollo, the lost and forgotton missions
David J Shayler, discusses the more obscure side of the apollo missions, mission changes/adaptations and the cancelled apollo 18, 19, 20 and the utilisation of apollo hardware for then future missions. 

Disaster and Accidents in Manned Spaceflight
David j Shayler, discusses pre space flight high altitude tests and spaceflights, the accidents and equipment failures in  various missions as well as those mission that involved the loss of the crew and/or ground personnel.

The Rocket Men
David J Shayler, discusses the soviet cosmonauts in the 1960 and 1970, the missions they partook in and the equipment/crafts involved.

Skylab, America Space Station
David J Shayler, talks about the 1970's space station, how it was built, the missions it was used for and the lesson learned.

Gemini, step to the Moon
David j Shayler, talks about the gemini missions, the equipment and men involved , the missions and what was learned and it helped found the apollo program.

Tracking Apollo to the Moon
Hamish Lindsay, discusses the Mercury, Gemini, Apollo and skylab projects in one volume, A good read for anyone interested in the 1960s-1070s American space program. 

Deep Space Chronicle
Asif Siddiqi, details space exploration of the planets spanning 1958 to 2000 in a year by year format. Great for anyone wanting to know what happened on a particular year.