The IAPSOP is a US-based private organization focused on the digital preservation of Spiritualist and occult periodicals published between the Congress of Vienna and the start of the Second World War.

Our all-volunteer staff digitizes, indexes and makes available free-of-charge these periodicals, in our archive, for use by students and researchers.

We have a standing want list and will respond promptly to inquiries and offers from sellers.

We accept contributions of material and labor to further this work.

If you want a complete local copy of IAPSOP's holdings, follow these instructions.

If you know what you're looking for, hit the archive index directly.

If you want to explore a particular area of the occult, start with the lists below, prepared by IAPSOP's directors.

If you are interested in practical teachings, browse our Lessons archive.