IAPSOP: A Digital Archive of Spiritualist and Occult Periodicals

IAPSOP, a US-based private organization, digitally preserves Spiritualist and occult periodicals published between the Congress of Vienna and World War II. Run entirely by volunteers, they digitize, index, and freely provide these periodicals to students and researchers. They actively seek donations of materials and labor and welcome inquiries from sellers. The website offers various access points: direct archive search, thematic lists, and a lessons archive. Contact IAPSOP Customer Support for assistance or technical issues.