For a deeply researched, historical account of the history of Modern Spiritualism go to:
https://www.snu.org.uk/the-pioneer-journal
What will be found is a FREE, downloadable resource covering in great detail the emergence of the movement, philosophy and religion of Spiritualism and all the pioneers whose dedication helped bring it about.
It is produced by Paul Gaunt, an expert on the history of Modern Spiritualism. He works at the SNU, the Spiritualists' National Union based in the UK.