Or you can do as I did. Save all the PDF's to a file and make an index of what each PDF covers. I print out any individual PDF I need. This cuts down quite a bit of paper clutter as often I am only looking for specifications or a single page of illustrations/technique.

I keep the printouts in a binder as I produce them. I suppose in twenty or thirty years I'll have them all printed and saved.

Example:

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“Whatever story you're telling, it will be more interesting if, at the end you add, "and then everything burst into flames.”
― Brian P. Cleary, You Oughta Know By Now