About Directives: Presidential Directives: Background and Overview
About Executive Orders (EO): Executive Orders and Proclamations
The Federation of American Scientists "Intelligence Resource Program" has a Presidential Directives and Executive Orders website -
http://www.fas.org/irp/offdocs/direct.htm - with some full-text for these directives:
NSPD - National Security Presidential Directives - Bush, G.W. Administration
PDD - Presidential Decision Directives - Clinton Administration
NSD - National Security Directives - Bush Administration
NSDD - National Security Decision Directives - Reagan Administration
EO - Executive Orders