Explaining that in library cataloging, "Rar" stands for Rariora (Rare Books).
Discussing the Civitates orbis terrarum , a legendary 16th-century atlas by Braun and Hogenberg. 212.rar
Recommending 7-Zip or The Unarchiver for cross-platform access. Option 2: The Historian’s Deep Dive Explaining that in library cataloging, "Rar" stands for