1) Hardbacks look better in my technical reference library. 2) Digital formats (non-proprietary) are best for textual or context searching. 3) Optimal solution is hardback in my library, and a searchable PDF on my hard drive. 4) Or, hardcopy (hardback or paperback) in my library and searchable copy on books.google.com

Any high school graduates out [their, they're, there]?
"...all the tools out their to manipulate..."
Perhaps the moderators let this pass on purpose to emphasize the educational failings in our English speaking (sic) cultures.

- English speaking Grandpa (actually a Great Grand Father)