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RareHistoricalPhotos is an educational resource for documentaries, courses, books, reference material, or self-learning.

RationalWiki is an educational resource for documentaries, courses, books, reference material, or self-learning.

Ray Optics Simulation is an educational resource for documentaries, courses, books, reference material, or self-learning.

RCPlanes Online is an educational resource for documentaries, courses, books, reference material, or self-learning.

ReactionFlash is an educational resource for documentaries, courses, books, reference material, or self-learning.

Read Scott Alexander is an educational resource for documentaries, courses, books, reference material, or self-learning.

Reasoned is an educational resource for documentaries, courses, books, reference material, or self-learning.

RecentlyExtinctSpecies is an educational resource for documentaries, courses, books, reference material, or self-learning.

Recherche Data Gouv

recherche.data.gouv.fr

Online data library for locating reusable datasets and supporting materials.

Red Blob Games is an educational resource for documentaries, courses, books, reference material, or self-learning.

Reitaku University Academic Repository (Japanese)

reitaku.repo.nii.ac.jp

Browse digitized texts, images, archives and cataloged cultural materials.

RetroFlix

retroflix.org

Moving-image archive from RetroFlix, with preserved film and television material for browsing and study.

Rgvaerialphotos is an educational resource for documentaries, courses, books, reference material, or self-learning.

Browse digitized texts, images, archives and cataloged cultural materials.

Ringwatchers is an educational resource for documentaries, courses, books, reference material, or self-learning.

Ringwatchers is an educational resource for documentaries, courses, books, reference material, or self-learning.

Rink is an educational resource for documentaries, courses, books, reference material, or self-learning.

rip.so is an educational resource for documentaries, courses, books, reference material, or self-learning.

Robert's Rocket Project is an educational resource for documentaries, courses, books, reference material, or self-learning.

Robot Shop is an educational resource for documentaries, courses, books, reference material, or self-learning.

RocketLaunch is an educational resource for documentaries, courses, books, reference material, or self-learning.

RocketPy is an educational resource for documentaries, courses, books, reference material, or self-learning.

RocketReviews is an educational resource for documentaries, courses, books, reference material, or self-learning.

Rocumentaries is an educational resource for documentaries, courses, books, reference material, or self-learning.