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A community-edited reference for recordings and releases

A collaboratively written mathematics encyclopedia

A subject-organized reference to Alabama

Regional history connected to Philadelphia's present

English definitions beside usage and collocation references

English dictionary lookup with explicit usage guidance

Discover peer-reviewed open-access books and publishers

Discover linked publications, datasets and research software

Physical constants linked to units and uncertainty guidance

Spectral lines and atomic energy-level reference data

Official MLA guidance on writing and documentation

Quran reading and listening organized by surah and topic

Minnesota historical entries filterable by topic and era

Oklahoma history searchable by name, era and topic

Cleveland historical articles with a multimedia search

Visual-art history through artists, movements and ideas

Manuscript images and metadata for medieval-music study

Population statistics organized through maps and tables

Nomenclatural reference for prokaryotic names

Interconnected reference on Victorian literature and culture

Taxonomic and distribution information about algae

Articles, maps and timelines on Jewish history and culture

Health information and service references for Victoria

Public reference material on nutrition and related health conditions