General, Essays, History, etc
Traditional Witchcraft. A Cornish Book of Ways - Gemma Gary
The Black Toad - Gemma Gary
Popular Magic: Cunning Folk in English History - Owen Davies
A Grimoire for Modern Cunning Folk - Peter Paddon
Treading the Mill - Nigel Pearson
Old Tradition Crafte - (translated by) Robin Artisan
West Country Witches - Michael Howard
Pretty much anything by Doreen Valiente, a Wiccan author but her work should not be avoided, in my opinion.
Hands of Apostasy, Essays on Traditional Witchcraft - Edited by Michael Howard and Daniel A. Schulke
To Fly By Night: An Anthology of Hedgewitchery - Veronica Cummer
Charms, Spell, Customs Etc:
Nummits and Crummits - Sarah Hewitt
Defences Against the Witches Craft - John Canard
Protection and Reversal Magic, Beyond 101 - Jason Miller
Crones Book of Charms and Spells - Valerie Worth
Crones Book of Magical Words - Valerie Worth
The Element Encyclopedia of 5,000 Spells - Judika Illes
Enchantment: The Witch’s Art of Manipulation through Gesture, Gaze and Glamour - Peter Paddon
The High Magic of Talismans and Amulets: Tradition and Craft - Claude Lecouteux
Charms, Spells, and Curses - V. J. Banis
Cornish Charms And Cures - Kelvin Jones
The Power of Poppets - Alexis Morrigan
Herbs, Potions, Incense, Recipes etc
Traditional Witches Formulary and Potion-making Guide - Sophia DiGregorio
The Complete Book of Incense, Oils and Brews - Scott Cunningham
Book of Herbs - Sybil Leek
Encyclopedia of Magical Herbs - Scott Cunningham
Herbs and Things. A Compendium of Practical and Exotic Herb Lore - Jeanne Rose
Encyclopedia of Folk Medicine. Old World and New World Traditions - Gabrielle Hatfield
Wicked Plants: The Weed That Killed Lincoln’s Mother and Other Botanical Atrocities - Am Stewart
Irish Wild Plants - Niall Mac Coitir
Magical Powder Recipes - Lady Gianne
Superstitions, Omens, Folk-Lore, Folk-Tales, etc
Superstitions Irish Country People - Padraic O'Farrell
Strange Superstitions and Curious Customs of the Ancient World - Alicia Chrysostomou & Matheos Chrysostomou
Traditions and Hearthside Stories of West Cornwall - William Bottrell
Irish Superstitions – Irish Spells, Old Wives’ Tales and Folk Beliefs - Daithi O Hogain
Traditions, Superstitions and Folk-lore (Chiefly Lancashire and the North of England - Charles Hardwick
Welsh Folk-Lore a Collection of the Folk-Tales and Legends of North Wales - Elias Owen
Cornish Folk Tales - Mike O’Connor
Divination, Fortune Telling etc
A Manual Of Cartomancy And Occult Divination - Arthur Edward Waite
Fortune Telling by Tea Leaves - Cecily Kent
The Art of Black Mirror Scrying - Rosemary Ellen Guiley
Pendulum Power - Greg Nielsen