History / Parapsychology / Paranormal / World War I / First World War / Angels / History of psychical research and parapsychology / Supernatural / Spiritualism / Psychical Research / Parapsychology, Anthropology, Mediumship, Phenomenology, Spiritualism, Paranormal, Supernatural, Folklore, Religion, Sociology / Arthur Koestler / Rupert Brooke / Society for Psychical Research / Angels / History of psychical research and parapsychology / Supernatural / Spiritualism / Psychical Research / Parapsychology, Anthropology, Mediumship, Phenomenology, Spiritualism, Paranormal, Supernatural, Folklore, Religion, Sociology / Arthur Koestler / Rupert Brooke / Society for Psychical Research
