Shortly after George Coy implemented the first public telephone exchange (switch) in New Haven, Connecticut in January of 1878, he realized the need to document the users. He subsequently published the first telephone directory consisting of a single piece of paper (cardboard) on February 21, 1878. It measured 14 cm x 21 cm, and listed 50 subscribers (residences, business, etc). By November of 1878, the New Haven telephone company grew to 391 subscribers, so he published a 20-page directory. In order to help his new subscribers learn their way around the new communication device, he published some simple instructions. Here are a few of those instructions: ...