Henry S. Whitehead (1882-1932), Voodoo Tales. Stories of voodoo, of ghosts, and assorted weirdness, originally published in pulp magazines like Weird Tales in the 1920s.
J W Brodie-Innes (1848-1923), The Devil’s Mistress. Witchcraft novel set in 17th century Scotland. Published in 1915.
Wilkie Collins (1824-1889), The Haunted Hotel and Other Stories. A superbly subtle gothic novella plus several short stories.
Alice Askew and Claude Askew, Aylmer Vance: Ghost-Seer. Psychic detective stories from the early 20th century.
Sax Rohmer (1883-1959), The Leopard Couch and Other Stories of the Fantastic and Supernatural. A fine collection of Rohmer’s weird fiction.