This page is an old index of other pages containing documentation, because EPICS documentation is distributed between the different parts of the project (and it's not all at the APS site either). In most cases, the documentation associated with a particular part of EPICS is found on the part of this site that is concerned with that part of the code, and the links below will take you to those areas.
A number of different document formats are used, depending on the original author's preferences. Hypertext (HTML) and PDF predominate, but PostScript is also occasionally used.
This document, along with other similar documents, was very specific to the particular release of Base it covered. You'll find a link to it or its replacement on the page for your Base release in the EPICS Base area.
As above, most recent versions of EPICS Base now have their own copy of the record documentation, so look at the index page for your version in the EPICS Base area. The latest version is available here from the docs.epics-controls.org website.
The original APS EPICS Documentation page will no longer be maintained or updated. If there are any documents listed there that you will need access to in the future but cannot find in this new documentation area please let me know.