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Forgotten Aviation documents historic aircraft and related warbird information.

Warbirds Resource Group collects historic aircraft information, registries, and aviation resources.

An archive of high-resolution scans from historic large-format negatives, Shorpy offers browsing, prints, and stock images.

The Stanford Encyclopedia of Philosophy provides an online encyclopedia with browse tools, new entries, and chronological archives.

The Logitext interactive tutorial teaches the sequent calculus through a simple set of inference rules.

The U-boat Archive provides documents and photographs about the Battle of the Atlantic.

Pessimists Archive documents historical panics about technology through a timeline and related articles.

A Book of Creatures is a guide to beings from myth, legend, and folklore.

Cost of Living provides cost-of-living data and information about the Numbeo API.

The Retro Web documents computer hardware, with its catalog presented through a web application.

The VGA Museum catalogs video graphics hardware by company and category.

This page documents Inuit mythology and traditional stories, with material presented in Inuktitut.

Theoi Project is a reference guide to Greek mythology, exploring gods, spirits, creatures, and heroes through classical literature and art.

rip.so is a digital graveyard memorializing discontinued messengers, social networks, browsers, gadgets and websites.

OilPrice publishes crude oil and gas price charts, futures information, energy news, and investment coverage.

EveryPolitician tracks political office holders, including legislators, judges, and rulers around the world.

Sued by Nintendo collects lawsuits and legal actions involving Nintendo.

Wealth, Shown to Scale visualizes differences in wealth using comparisons from household income to billionaire fortunes.

The Retro Web provides a motherboard database with search and filters for vintage computers.

Umsu offers a reference for mathematical and logical symbols, including connectives and quantifiers.

Data USA provides visualizations and reports based on public U.S. government data.

iCivics provides educational resources and activities about civics for classroom use.

Seterra offers more than 400 geography map quizzes, with printable materials for educators and mobile play.

History section of the Humanities LibreTexts bookshelves organizing materials into World History, National History, State and Local History, and Historical Studies.