“Unseen Forces: Nature Spirits, Thought Forms, Ghosts and Specters, The Dweller on the Threshold” by Manly P. Hall

"Unseen Forces: Nature Spirits, Thought Forms, Ghosts and Specters, The Dweller on the Threshold" by Manly P. Hall

"This book by Canadian-born mystical writer Manly P. Hall comprises of a series of lectures on nature spirits, thought forms, ghosts and specters, the dweller on the threshold. This compilation was first published in 1924."