HCO PLs written by LRH only. This is a permanently valid issue of all Third Dynamic, organization and administrative technology. These, regardless of date or age, form the knowhow in running a Scientology Church, organization, group or company. The bulk of hat material is made up from HCO PLs. They are printed in green ink on white paper and are distributed to all staff or as indicated or as made up in packs. (HCO PL 24 Sept 70R)