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Structural language properties in a comparative database

Bible search with precise control over the books searched

An independent reference for Steam catalogue and activity data

British and Irish case law and legislation

Educational collections of historical source texts

Dictionary, thesaurus and grammar reference in one service

A configurable vault for credentials and reference data

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

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

Ancient-history articles with illustrations and topic browsing

Norwegian encyclopedia entries across a broad subject range

Mineral and gemstone descriptions for reference study

Academic reference guidance on using sources in papers