The NeXT Book by Bruce F. Webster published in the beginning of the NeXT Computer era. I had three NeXT computers, the original NeXT Cube, a NeXTStation color and a NeXTStation Turbo Color (the last one is still in my cupboard). It's amazing that the OS, NeXTStep, is basically what eventually became the operating systems that power Apple's present day machines. The paperback book is in very good condition. 387 pages, covering both the original hardware and the software.