PubChem
pubchem.ncbi.nlm.nih.govChemical structures, substances and bioassay information
Chemical structures, substances and bioassay information
Detailed bird life histories with maps and multimedia
Open textbooks for higher-education subjects
Curated learning-resource discovery by discipline
Guides for international and foreign legal research
Academic phrasing organized by rhetorical purpose
Anatomy articles, diagrams and three-dimensional learning material
Pathology images and tutorials for medical education
An ophthalmology encyclopedia written by eye specialists
Dictionary, thesaurus and grammar reference in one service
Learn and test text patterns with live feedback
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
Develop mobile illustrations with editable brushes and layered drawing
Animal reference searchable by information and media type
A curated registry of biological and biomedical ontologies
Controlled terminology for art and cultural-heritage research
Educational tools for examining global facts and assumptions
Shakespeare texts with scholarly and educational context
A multilingual encyclopedia with a language-aware search
Related English words for revising a draft