I kept my compiler textbooks, my computer architecture textbooks, and my algorithms textbooks. These include Crafting a Compiler, Engineering a Compiler, Code (

I kept my compiler textbooks, my computer architecture textbooks, and my algorithms textbooks. These include Crafting a Compiler, Engineering a Compiler, Code (by Petzold), Computer Architecture (by Hennessy). By far the one I reference most is Skiena's Algorithm Design Manual. I actually bought the new edition of that one for myself since it's in color now. My $250 differential equations textbook was ritualistically burned at the earliest opportunity.