Esoteric Archive collects books and other media about Western esoterica and the occult.
IAPSOP
The IAPSOP archive collects historical parapsychology materials and currently displays a notice about restricted service.
About IAPSOP
IAPSOP is a US-based private organization that digitizes, indexes, and makes available free of charge Spiritualist and occult periodicals and monographs published between the Congress of Vienna and the start of the Second World War, called the Standard Spiritualist and Occult Corpus. Holdings are organized by tradition, including US, UK, French, German, and Spanish Spiritualism, Theosophy, New Thought, and American, UK, French, and German occultism, for use by students and researchers.
The site states that connection speed is currently throttled and total bandwidth per connection is limited due to crawler traffic. It reports holdings of 4.95 million total pages, 60,000+ files, and 1.2 TB of data.
Key features
- Digitized Spiritualist and occult periodicals from Congress of Vienna to WWII
- Monograph collection within Standard Spiritualist and Occult Corpus
- Browse holdings by tradition such as US, UK, French Spiritualism
- Theosophy, New Thought and occultism collections by country
- Indexed files for student and researcher use
- Responsive HTML for small-form-factor devices
Best for: Students and researchers working with historical Spiritualist and occult periodicals published between the Congress of Vienna and the start of the Second World War.
Good for
- Available free of charge for students and researchers
- Reports 4.95 million total pages across periodicals and monographs
- Organization by tradition and country for browsing holdings
Watch out for
- Connection speed is currently throttled
- Total bandwidth for any one connection is limited
IAPSOP at a glance
- Website
- iapsop.com
- Category
- Books & Reading › Reading Resources
- Type
- Website
- Pricing
- Free
- Platforms
- Web
- Open source
- Not stated
- Language
- English
- Last checked
- Oct 5, 2026 · Online when checked
- Listed
- Oct 5, 2026
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IAPSOP FAQ
Why is access currently slow or limited?
The site states connection speed is throttled and bandwidth per connection is limited due to crawler traffic, which it attributes to bots collecting material to train large language models.
What time period does the collection cover?
Spiritualist and occult periodicals and monographs published between the Congress of Vienna and the start of the Second World War.
Can I contribute material to the archive?
Yes. The site states it accepts contributions of material and labor, maintains a standing want list, and responds to inquiries and offers from sellers.
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