Reference

Brain reference atlases and research datasets

Taxonomic and distribution information about algae

English definitions beside usage and collocation references

Population statistics organized through maps and tables

Educational summaries on anesthesia and perioperative subjects

Regional history connected to Philadelphia's present

Biographical and bibliographical reference to classical scholarship

A full-text archive of biomedical research articles

Minnesota historical entries filterable by topic and era

Taxonomic lookup for living reptile species

Contemporary English lookup with vocabulary exercises

Washington state history through essays and timelines

Research explanations paired with charts and data explorers

Dermatology reference with topic and image browsing

An interconnected reference for advanced mathematical ideas

Mammal taxonomy tracked through versioned releases

Spectral lines and atomic energy-level reference data

The unedited early twentieth-century Jewish Encyclopedia

Visual-art history through artists, movements and ideas

Search annotated records of the American founding era

Oklahoma history searchable by name, era and topic

Protein sequences connected with functional information

Quran reading and listening organized by surah and topic

Public legal texts alongside explanatory reference material