There's significantly more for the TI Explorer Lisp machine: http://bitsavers.trailing-edge.com/pdf/ti/explorer/

And even more for Symbolics: http://bitsavers.trailing-edge.com/pdf/symbolics/

Xerox did a Lisp machine line: http://bitsavers.trailing-edge.com/pdf/xerox/interlisp/

There's a working emulator for the MIT CADR: http://www.unlambda.com/cadr/index.html

And you can of course run Genera in an emulator: http://www.unlambda.com/download/genera/

There's a semi working TI explorer emu: http://www.unlambda.com/lispm/