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The Philadelphia Doctorate Course (PDC) was a lecture series delivered by L. Ron Hubbard to 33 Auditors in December 1952.

The 63 (+11 supplemental) lectures parallel and expand on the material contained in Scientology 8-8008, mapping out the route to Operating Thetan through Standard Operating Procedure (SOP). At the start of the PDC, SOP III was the recommended procedure. During the PDC SOP IV and V were devoloped as the faster refinements for auditing PreClears up to OT.

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