a book written by L. RonHubbard in 1951 to fill the need for an advanced personal workbook for auditors and preclears. See also auditor and preclear in this glossary.—ClearingCongress Film №2 Approved Glossary, —PDC Volume 1 Approved Glossary, —PDC Volume 3 Approved Glossary, —PDC Volume 5 Approved Glossary, —PDC Volume 8 Approved Glossary