Emergency Library Hologram
The Emergency Library Hologram (ELH) is a specialised hologram developed by the makers of the Emergency Medical Hologram. It is outfitted with an extensive library database and is mainly used for aiding in Library research by providing shortcuts, summaries, and critical information of literary work, both fictive, non-fictional, and educational. The first ELH was installed in the USS Montreal in 2385, but it has since then expanded to multiple Federation archives and libraries.
It's use is only in emergency, where an sentient being is unavailable. It also is very limited, providing little aid regarding tactical or engineering matters.