The Sevagram Index:

An A.E. van Vogt Bibliography
Title Index
An alphabetical index of all bibliographic entries, including all alternate titles.
The bibliography's introduction, describing its purpose, history, sources, and guidelines.
Format Guide
A guide to the bibliography's format. I've tried to make the layout of information as intuitive as possible, so reading this guide is not required; I've merely written it to clear up any ambiguity.
A list of all the updates and changes made to the bibliography.