Man pages matching name pmwhichzone in section 3:

pmWhichZone.3.en	debian 10 / libpcp3-dev
pmwhichzone.3.en	debian 10 / libpcp3-dev
pmWhichZone.3.en	debian 11 / libpcp3-dev
pmWhichZone.3.en	debian 12 / libpcp3-dev