Recently I noticed that most of us just leave our homebound (or elsewhere) books, just lying around in our ages,
subject to weather, wind and wild animals, not to mention all kinds of microbes.
Also, there is always the danger of an unscrupulous individual changing the book, making the linking book unusable
To this end, I developed a new type of linking book and book holder, inspired by the much more durable stones the Bahro use, called the DuraBook
Picture of an early DuraBook prototype:

Basically, it is a durable aluminum shell, with an unbound linking book inside.
The linking panel of the book is not exposed, but is covered by an new type of organic and conductive plastic that is linking-permeable.
(Allowing link-out by touching the panel, but still protecting the panel against damage.)
An added benefit of the plastic cover is that it only allows larger creatures to link, protecting the target age from infestation by insects and other small creatures that accidentally land on or touch the linking panel.
More advanced versions include:
DuraBook Secure: with an added thumbprint locking mechanism, only you can access the book inside.
DuraBook EasyLink: No need to bring pen and ink with you to make a linking book anymore: just go to the target Age and site, pull out a small protective plastic, slam the stamp-button, and presto! The internal stamp-and-ink system will stamp the special symbol onto the page inside, activating the linking book onto that target spot.
[OOC]
Just made up the basic model today, if anyone is interested in the model and its backstory , I'll finish it up, and post it publicly.