The yellow one was for businesses. Residential phone numbers and often addresses where in the white book.

Saw a story in this direction just last week (maybe that’s what you’re referring to but it sounded like a hypothetical)

https://web.archive.org/web/20250828210802/https://www.bostonglobe.com/2025/08/22/metro/vaccine-public-health-massachusetts-pennsylvania-rhode-island-vermont-connecticut-maine-kennedy-trump/