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It was an archaic tome known as the Yellow Pages printed on a thin material called paper.

Ah yes, the Yellow Pages food delivery service. Don't know how I missed it.

They had a whole menu in the yellow pages?

They had a lot of menus in the yellow pages. Pages and pages of menus. Not for every restaurant, though, just those that paid for them.

And some people had a crazy idea, call a restaurant and ask what they can recommend or what they specialty is.

"Radio on the internet"

s/Radio/Phonebook