These are just some of my favourite books on Spiritualism
Sir Arthur Conan Doyle:

History of Spiritualism Volume One
History of Spiritualism Volume Two

Arthur Findlay:

On the Edge of the Etheric
The Rock of Truth
The Unfolding Universe
The Torch of Knowledge
The Psychic Stream
The Curse of Ignorance Volume One
The Curse of Ignorance Volume Two
Where Two Worlds Meet
The Way of Life
Looking Back
The Effect of Religion on History

Emma Hardinge-Britten:

The Autobiography of Emma Hardinge-Britten
Faiths Facts and Frauds

Jean Bassett:

100 Years of National Spiritualism

Gordon Higginson:

On the Side of Angels

Maurice Barbanell:

The Power of the Spirit

Maurice Barbanell and Silver Birch:

Teachings of Silver Birch
Guidance from Silver Birch
Philosophy of Silver Birch
More Philosophy of Silver Birch
Light from Silver Birch
Silver Birch Companion
A Voice in the Wilderness
The Seed of Truth
The Spirit Speaks
Lift Up your Hearts