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A wide subject reference to West Virginia

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

A global bird classification with English naming guidelines

Discover peer-reviewed open-access books and publishers

Discover linked publications, datasets and research software

Astronomical objects connected to literature and identifiers

Physical constants linked to units and uncertainty guidance

Spectral lines and atomic energy-level reference data

Official MLA guidance on writing and documentation

A connected library of Jewish texts and commentaries

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

Australian scientific history connected to archival sources

Convention case-law knowledge by article and theme

Look up US winter hardiness zones

Taxonomic lookup for living reptile species

Treaty records and depositary information

Visual-art history through artists, movements and ideas