You can search for content at any time. From the homepage:
To browse content in the University Archive:
When copyright permits, the PG University Archive will host an open access version of the work for download, accessible by anyone. Hosted copies may be pre-print, post-print, or publisher's versions, depending on what is permitted. When full text is available, a copy will appear under Files when viewing an item. Click the link to open it.
An open access copy is not always permitted to be hosted. In these cases, or when required by the publisher, a link to the full text will be added as a second URI in the item's record.
The standard record on a View Item page in the PGUA consists of:
A "Full item page" link is also available to review the full metadata for the item.