A treatise of 1875 on the 'principle of continuity', which attempted to prove the immortality of the soul.

The Unseen Universe 2017, Andesite Press

ISBN-13: 9781376278149

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The Unseen Universe 2015, Andesite Press

ISBN-13: 9781296629755

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The Unseen Universe... 2012, Nabu Press, Charleston SC

ISBN-13: 9781276816366

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The Unseen Universe... 2012, Nabu Press, Charleston SC

ISBN-13: 9781279369326

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The Unseen Universe 2009, Cambridge University Press, Cambridge

ISBN-13: 9781108004541

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The Unseen Universe; 2006, University of Michigan Library, Ann Arbor, MI

ISBN-13: 9781425518721

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