AGPE stands for Association du Gharb pour la Protection de l'Environnement (French: Gharb Association for the Protection of the Environment;…
AGPCS stands for Asociación Guatemalteca de Prevención y Control de SIDA (Guatemalan Association for the Prevention and Control of AIDS)
AGPAUX stands for Agencia Postal Auxiliar (Spanish: auxiliary postal agency; philatelic cancel mark)