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Mathematical worksheets with natural notation and units

Find Unicode characters by properties or appearance

Searchable primary and secondary British historical works

An interactive periodic table with property and isotope views

Edited texts across Isaac Newton's varied writings

A US invasive-plant reference for identification and distribution

Translations and research tools for Tibetan Buddhist texts

Search annotated records of the American founding era

Acronym meanings organized by subject context

Home improvement shows and practical project references

A collection of tabletop generators and reference tools

Bonn datasets by municipal subject