There are more than 12,000 regional checklists in Avibase, offered in 9 different taxonomies, including synonyms more than 175 languages. Each checklist can be viewed with photos shared by the birding community, and also printed as PDF checklists for field use.
There are a few ways by which you can help the development of this page, such as joining the Flickr group for photos or providing translations of the site in addition languages.
Corvus enca enca: Java, Bali and Mentawi Archipelago
Corvus enca celebensis: Sulawesi, Talaud Is., Togian Is. and Tukangbesi Is.; population in the Banggai Is. probably this subspecies (but possibly is Corvus enca mangoli).
Corvus enca mangoli: Sula Islands (Taliabu, Seho, Mangole and Sanana)
Corvus enca pusillus: S Philippines (Balabac, Culion, Mindoro and Palawan)
Corvus enca samarensis: S Philippines (Samar and Mindanao)
Corvus enca sierramadrensis: N Philippines (Sierra Madre Mountains of Luzon)