How do you even find the number to call? I remember, many years ago, as a recent grad, getting a directory of local businesses to try cold-calling in search of

How do you even find the number to call? I remember, many years ago, as a recent grad, getting a directory of local businesses to try cold-calling in search of a job, and it was just hundreds of pages of completely opaque defunct businesses, shell companies, one-person businesses, that either didn't have a working phone number or just never picked up.