I have a friend whose parents met with the assistance of that book.
His parents met because his mom was in town for a funeral. It made no sense to me at first; since his father did not know the deceased and did not meet at the funeral, how did they meet? His mother’s family had to use the book to find a place where they would allow black people to stay, since normal lodging places, and some towns, could be fatally hostile to people of color. The school that the friend’s father attended was open to allowing travelers to rent unused form rooms. While she was on campus, they encountered each other.