Here are some topics they have in the free e-book section
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A Series of Lessons in Personal Magnetism, Psychic Influence, Thought-Force, Concentration, Will-Power, and Practical Mental Science (1901)
Clairvoyance and Occult Powers [as Swami Panchadasi] (1916)
Mind Power: The Secret of Mental Magic (1907)
Practical Mind Reading: A Course of Lessons on Thought-Transference, Telepathy, Mental Currents, Mental Rapport, etc. (1907)
Austin, Benjamin Fish (1850-1932)
Glimpses of the Unseen: A Study of Dreams, Premonitions, Prayer and Remarkable Answers, Hypnotism, Spiritualism, Telepathy, Apparitions, Peculiar Mental and Spiritual Experiences, Unexplained Psychical Phenomena (1898)
Telepathy: Genuine and Fraudulent (1919)
Balfour, Gerald William (1853-1945)
The Ear of Dionysius: Farther Scripts Affording Evidence of Personal Survival (1920)
Bates, E. Katharine [Emily Katharine]
Do the Dead Depart?: And Other Questions
Psychical Science and Christianity: A Problem of the XXth Century (1909)
Seen and Unseen (1907)
Beighle, Nellie (1851-1916)
Book of Knowledge: Psychic Facts (1911)
Bell, Clark
Spiritism, Hypnotism and Telepathy: As Involved in the Case of Mrs. Leonora E. Piper and the Society of Psychical Research [with Thomson Jay Hudson] (1904)
Bennett, Ernest Nathaniel (1865-1947)
Wikipedia
Apollonius: Or, the Present and Future of Psychical Research (1920?)
Besant, Annie (1847-1933)
Wikipedia
Annie Besant: An Autobiography (1893)
Death -- And After? (Theosophical Manuals, No. 3) (1906)
Investigations into the Super-Physical (Adyar Pamphlets, No. 36) (1913)
Nature's Finer Forces (Adyar Pamphlets, No. 94) (1918)
Thought Forms [With C.W. Leadbeater] (1905)
Blavatsky, Helena Petrovna (1831-1891)
Wikipedia
From the Caves and Jungles of Hindostan (1892)
Isis Unveiled: A Master-Key to the Mysteries of Ancient and Modern Science and Theology (1919)
The Secret Doctrine: The Synthesis of Science, Religion, and Philosophy. Volume I: Cosmogenesis (1888)
The Secret Doctrine: The Synthesis of Science, Religion, and Philosophy. Volume II: Anthropogenesis (1888)
The Secret Doctrine: The Synthesis of Science, Religion, and Philosophy. Volume III (1893)
The Secret Doctine: The Synthesis of Science, Religion, and Philosophy. Index to Vols. I, II and III (1888)
Boirac, Émile (1851-1917)
Wikipedia
Our Hidden Forces: An Experimental Study of the Psychic Sciences (1917)
The Psychology of the Future (1918)
Broad, C.D. [Charlie Dunbar] (1887-1971)
Wikipedia
Lectures on Psychical Research: Incorporating the Perrott Lectures Given in Cambridge University in 1959 and 1960 (1962)
Broughton, Luke Dennis (1828-1898)
The Elements of Astrology (1898)
Brown, George
Occult Psychology (1919)
Buchanan, Joseph Rodes (1814-1899)
Wikipedia
Manual of Psychometry: The Dawn of a New Civilization (1885)
Cadwallader, Mary E.
Hydesville in History (1917)
Calmet, Augustine (1672-1757)
Wikipedia
The Phantom World: Or, The Philosophy of Spirits, Apparitions, etc. (1850)
Carrington, Hereward (1880-1958)
Wikipedia
Death: Its Causes and Phenomena with Special Reference to Immortality (1912)
Eusapia Palladino and her Phenomena (1909)
Higher Psychical Development (Yoga Philosophy): An Outline of the Secret Hindu Teachings (1920)
Modern Psychical Phenomena: Recent Researches and Speculations (1919)
Personal Experiences in Spiritualism (Including the Official Account and Record of the American Palladino Seances) (1913)
Psychical Phenomena and the War (1918)
The Coming Science (1908)
The Physical Phenomena of Spiritualism, Fraudulent and Genuine (1908)
The Physical Phenomena of Spiritualism: Being a Brief Account of the Most Important Historical Phenomena, with a Criticism of their Evidential Value (1920)
The Problems of Psychical Research: Experiments and Theories in the Realm of the Supernormal (1921)
True Ghost Stories (1915)
Your Psychic Powers and How to Develop Them (1920)
Cheiro [William John Warner] (1866-1936)
Wikipedia
Cheiro's Language of the Hand: Complete Practical Work on the Sciences of Cheirognomy and Cheiromancy, Containing the System, Rules, and Experience of Cheiro (1900)
Palmistry for All: Containing New Information on the Study of the Hand Never Before Published (1910)
CLICK ME / Source
A Series of Lessons in Personal Magnetism, Psychic Influence, Thought-Force, Concentration, Will-Power, and Practical Mental Science (1901)
Clairvoyance and Occult Powers [as Swami Panchadasi] (1916)
Mind Power: The Secret of Mental Magic (1907)
Practical Mind Reading: A Course of Lessons on Thought-Transference, Telepathy, Mental Currents, Mental Rapport, etc. (1907)
Austin, Benjamin Fish (1850-1932)
Glimpses of the Unseen: A Study of Dreams, Premonitions, Prayer and Remarkable Answers, Hypnotism, Spiritualism, Telepathy, Apparitions, Peculiar Mental and Spiritual Experiences, Unexplained Psychical Phenomena (1898)
Telepathy: Genuine and Fraudulent (1919)
Balfour, Gerald William (1853-1945)
The Ear of Dionysius: Farther Scripts Affording Evidence of Personal Survival (1920)
Bates, E. Katharine [Emily Katharine]
Do the Dead Depart?: And Other Questions
Psychical Science and Christianity: A Problem of the XXth Century (1909)
Seen and Unseen (1907)
Beighle, Nellie (1851-1916)
Book of Knowledge: Psychic Facts (1911)
Bell, Clark
Spiritism, Hypnotism and Telepathy: As Involved in the Case of Mrs. Leonora E. Piper and the Society of Psychical Research [with Thomson Jay Hudson] (1904)
Bennett, Ernest Nathaniel (1865-1947)
Wikipedia
Apollonius: Or, the Present and Future of Psychical Research (1920?)
Besant, Annie (1847-1933)
Wikipedia
Annie Besant: An Autobiography (1893)
Death -- And After? (Theosophical Manuals, No. 3) (1906)
Investigations into the Super-Physical (Adyar Pamphlets, No. 36) (1913)
Nature's Finer Forces (Adyar Pamphlets, No. 94) (1918)
Thought Forms [With C.W. Leadbeater] (1905)
Blavatsky, Helena Petrovna (1831-1891)
Wikipedia
From the Caves and Jungles of Hindostan (1892)
Isis Unveiled: A Master-Key to the Mysteries of Ancient and Modern Science and Theology (1919)
The Secret Doctrine: The Synthesis of Science, Religion, and Philosophy. Volume I: Cosmogenesis (1888)
The Secret Doctrine: The Synthesis of Science, Religion, and Philosophy. Volume II: Anthropogenesis (1888)
The Secret Doctrine: The Synthesis of Science, Religion, and Philosophy. Volume III (1893)
The Secret Doctine: The Synthesis of Science, Religion, and Philosophy. Index to Vols. I, II and III (1888)
Boirac, Émile (1851-1917)
Wikipedia
Our Hidden Forces: An Experimental Study of the Psychic Sciences (1917)
The Psychology of the Future (1918)
Broad, C.D. [Charlie Dunbar] (1887-1971)
Wikipedia
Lectures on Psychical Research: Incorporating the Perrott Lectures Given in Cambridge University in 1959 and 1960 (1962)
Broughton, Luke Dennis (1828-1898)
The Elements of Astrology (1898)
Brown, George
Occult Psychology (1919)
Buchanan, Joseph Rodes (1814-1899)
Wikipedia
Manual of Psychometry: The Dawn of a New Civilization (1885)
Cadwallader, Mary E.
Hydesville in History (1917)
Calmet, Augustine (1672-1757)
Wikipedia
The Phantom World: Or, The Philosophy of Spirits, Apparitions, etc. (1850)
Carrington, Hereward (1880-1958)
Wikipedia
Death: Its Causes and Phenomena with Special Reference to Immortality (1912)
Eusapia Palladino and her Phenomena (1909)
Higher Psychical Development (Yoga Philosophy): An Outline of the Secret Hindu Teachings (1920)
Modern Psychical Phenomena: Recent Researches and Speculations (1919)
Personal Experiences in Spiritualism (Including the Official Account and Record of the American Palladino Seances) (1913)
Psychical Phenomena and the War (1918)
The Coming Science (1908)
The Physical Phenomena of Spiritualism, Fraudulent and Genuine (1908)
The Physical Phenomena of Spiritualism: Being a Brief Account of the Most Important Historical Phenomena, with a Criticism of their Evidential Value (1920)
The Problems of Psychical Research: Experiments and Theories in the Realm of the Supernormal (1921)
True Ghost Stories (1915)
Your Psychic Powers and How to Develop Them (1920)
Cheiro [William John Warner] (1866-1936)
Wikipedia
Cheiro's Language of the Hand: Complete Practical Work on the Sciences of Cheirognomy and Cheiromancy, Containing the System, Rules, and Experience of Cheiro (1900)
Palmistry for All: Containing New Information on the Study of the Hand Never Before Published (1910)