https://picryl.com

PICRYL collections provide access to millions of public domain objects.

 

https://search.creativecommons.org/

Creative Commons (CC) copyright-free content search engine.

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https://www.flickr.com/photos/britishlibrary/albums/

British Library public domain collection cataloged by topics.

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https://nara.getarchive.net/search

The objects in this collection are from The U.S. National Archives and Defense Visual Information Distribution Service. The U.S. National Archives and Records Administration (NARA) was established in 1934 by President Franklin Roosevelt.

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https://www.europeana.eu/en

EUROPEANA gives access to millions of public domain items from providing institutions across Europe.

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https://www.openculture.com/

Founded in 2006, Open Culture brings together high-quality cultural & educational media for the worldwide lifelong learning community. Online courses, movies, books, art and more.

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https://www.wikiart.org/

WikiArt already features some 250.000 artworks by 3.000 artists, localized on 8 languages. These artworks are in museums, universities, town halls, and other civic buildings of more than 100 countries. Some of this art is in public domain. 

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https://www.rijksmuseum.nl/en/rijksstudio

​​Rijksmuseum (National Museum of the Netherlands) archive of high-resolution public domain paintings in museum collection.

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https://en.numista.com/

 NUMISTA offers one of the largest numismatic catalogs in the world, currently counting 384 350 listings. The catalog is a knowledge base, freely accessible online for researchers in academia, collectors, and the general public alike.

 

https://commons.princeton.edu/soviet/

Princeton University collection of illustrated Soviet books for children 1917—1953

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https://tobacco.stanford.edu/

The Stanford Research into the Impact of Tobacco Advertising (SRITA) collection currently contains 62,547 tobacco advertisements.

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https://www.warcopy.com/

A webpage dedicated to reconstructing items used in WW2 historically correctly.

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https://www.airlinesafetycards.be/Safety%20cards.htm

A personal blog dedicated to planespotting with the collection of aircraft safety cards, sorted alphabetically by company, type and year. With all dimensions in centimeters!

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https://www.pictureboxblue.com/​

Public domain collection of vintage maps, postcards, and illustrations cataloged by topic.