Palo isn’t a book religion, but a secret tradition taught in person through initiations; it has roots in slavery, and isn’t shared with outsiders. That said, here are a few related topics you can research on your own if you’re really curious:

Kongo Philosophy

Palo draws most of its concepts (along with much of its vocabulary) straight from Kongolese shamanism.

Flash of the Spirit: African & Afro-American Art & Philosophy	African Cosmology of the Bantu-Kongo	Death and the Invisible Powers: The World of Kongo Belief

Hoodoo

Hoodoo (also known as “Rootwork” or “Conjure”) is a a style of African-American folk magic heavily influenced by Kongolese witchcraft. It shares with Palo certain techniques involving the use of herbs and graveyard dirt for sympathetic and contagious magic.

Voodoo and Hoodoo: The Craft as Revealed by Traditional Practioners	A Spiritual Worker’s Spell Book	Blue Roots: African-American Folk Magic of the Gullah People

Other Afro-Carribbean Traditions

Palo Mayombe is part of the larger family of Afro-Carribbean traditions which also includes Obeah (Jamaica), Santeria (Cuba) and Voudon (Haiti).

Creole Religions of the Caribbean	Magical Herbal Baths of Santeria	Magico-Religious Groups and Ritualistic Activities: A Guide for First Responders

Palo Mayombe CDs

Authentic Palo ritual music from Cuba

Religious Music of Palo Monte – A Cajon Ceremony	Havana and Matanzas, Cuba 1957: Bata, Bembe and Palo	Fiesta de Palo : Santa Marta Dominadora