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BLB is the abbreviation for:
- Badische Landesbibliothek in Karlsruhe
- Construction and real estate company NRW
- the transport company Berchtesgadener Land Bahn
- the transport company association Berlin Linien Bus
- Berlin wage tax advice for employees
- the former railway company Bern-Luzern-Bahn
- the Biolab module in the Columbus space laboratory on board the ISS
- the American rock band Black Light Burns
- Brandenburg State Office for Real Estate and Construction in Potsdam
- Bremer Landesbank
- the former local railway company Bukowinaer Lokalbahnen
- the Burgenlandbahn (Saxony-Anhalt) , a brand used by DB Regio AG for local rail passenger transport in southern Saxony-Anhalt
- Bad Berleburg in the Siegen-Wittgenstein district (license plate)