The Corpus of Editorial Principles (in CEEC-400 Sources), or CEP, contains scanned images of title pages and editorial principles (or any text interpretable as such) from the printed sources of the Corpora of Early English Correspondence (CEEC-400). CEP was built as part of the ERRATAS project, which surveyed all the sources of CEEC-400 in order to investigate their editorial practices. CEP consists of: A manual A list of sources (bibliographical details) Pdfs of scanned and photographed images from printed editions, zipped in folders grouped by CEEC-400 subcorpus As most of the sources of CEEC-400 are under copyright, this resource is only available for use upon request. Version history: 26.5.2020 Version 0.8 – Unfinished (due to coronavirus restrictions); data checked once. 2.11.2020 Version 1.0 – Data rechecked and corrected, images added and fixed, files renamed. 1.4.2023 Version 1.1 – Added HART to PCEEC files, made corrections to ADDISON in CEECE files. Packages rezipped to omit hidden files. Manual updated.