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Ausgesinn
- C
- C'era una volta il West
- C'est Karma
- C'est dur pour tout le monde
- C'est jamais loin
- C'est pas parce qu'on a rien à dire qu'il faut fermer sa gueule
- C'est peut-être pas l'Amérique
- C++
- C-Plusplus
- C-days
- C.A. Spora Lëtzebuerg
- C.M.P
- C.N.I. "Les Thermes"
- C.O.S.L.
- C.S. Gréiwemaacher
- C.S. Pétange
- C. Aubrey Smith
- C. Bechstein
- C. Bechstein Pianofortefabrik
- C. Bechstein Pianofortefabrik AG
- C. Douglas Dillon
- C. Herschel (Moundkrater)
- C. M. Spoo
- C. Malans
- C. Thomas Howell
- C/1874 H1 (Coggia)
- C/1910 A1
- C/1955 O1
- C/1973 E1 (Kohoutek)
- C/1975 V1 (West)
- C/1980 E1 (Bowell)
- C/1999 S4 (LINEAR)
- C/2001 Q4 (NEAT)
- C/2006 P1 (McNaught)
- C/2007 N3 (Lulin)
- C/2009 R1 (McNaught)
- C/2010 X1 (Elenin)
- C/2011 L4 (PANSTARRS)
- C/2011 W3 (Lovejoy)
- C/2012 S1
- C/2013 A1 (Siding Spring)
- C/2013 R1 (Lovejoy)
- C/2014 Q2 (Lovejoy)
- C1
- C12H22O11
- C2
- C2DH
- C2H5OH
- C2H6
- C3H7OH
- C3H8
- C3H8O3
- C4
- C4H10
- C6
- C6H12O6
- CAKE
- CAL
- CAL-Spora Lëtzebuerg
- CALIPSO
- CAPe
- CA Fola Esch
- CA Spora Luxembourg
- CA Spora Lëtzebuerg
- CBP Quilvest
- CBS
- CCD-Sensor
- CCRN
- CC 40100 (SNCF)
- CC 6500 (SNCF)
- CD-Galaxie
- CDMH
- CDREF
- CDRR
- CDS-PP
- CDSR
- CDU
- CD (Homonymie)
- CDays
- CECA
- CEGEDEL
- CEMT-Klasse fir Schëffer
- CEPS/INSTEAD
- CERN
- CFA-Frang
- CFL
- CFL-Busdéngscht
- CFL-Direktiounsgebai
- CFL-Dosto
- CFL-Linn 1
- CFL-Linn 1a
- CFL-Linn 1b
- CFL-Linn 2
- CFL-Linn 2b
- CFL-Linn 3
- CFL-Linn 4
- CFL-Linn 5
- CFL-Linn 50
- CFL-Linn 6
- CFL-Linn 60
- CFL-Linn 60 / Antenn Wuelmereng
- CFL-Linn 6 / Antenn Rëmeleng
- CFL-Linn 6 / Antenn Wuelmereng
- CFL-Linn 6a
- CFL-Linn 6b
- CFL-Linn 6c
- CFL-Linn 6d
- CFL-Linn 6e
- CFL-Linn 6f
- CFL-Linn 6g
- CFL-Linn 6h
- CFL-Linn 6j
- CFL-Linn 6k
- CFL-Linn 7
- CFL-Linn 70
- CFL-Linn 80
- CFL-Serie 1060
- CFL - Dosto
- CFL 1030
- CFL 150
- CFL 1600
- CFL 1800
- CFL 2000
- CFL 2100
- CFL 2200
- CFL 2300
- CFL 2400
- CFL 250
- CFL 260
- CFL 300
- CFL 3000
- CFL 3000 / Serie 13 SNCB
- CFL 3600
- CFL 38
- CFL 40
- CFL 4000
- CFL 450
- CFL 5519
- CFL 56
- CFL 800
- CFL Corail
- CFL Wegmann
- CFL cargo
- CFNL
- CGDIS
- CGFP
- CGIS
- CH2Cl2
- CH3OH
- CH4
- CHARA-Array
- CHL
- CIBETT
- CID-femmes
- CID/Fraen an Gender
- CIGL
- CINEOS
- CITA
- CLT
- CLT-UFA
- CLVV
- CM
- CM-Nord
- CMP
- CNA
- CNAM
- CNC
- CNIS
- CNL
- CNN International
- CNPD
- CO2
- COMPASS-1
- CORALIE-Spektrograph
- COROT (Weltraumteleskop)
- COS-B
- COSL
- COSPAR-Bezeechnung
- COVID-19
- COVID-19-Pandemie
- COVID-19-Pandemie zu Lëtzebuerg
- CPCA
- CPLL
- CPLP
- CP Lacertae
- CP Puppis
- CQ
- CQFD
- CQ (Film)
- CR
- CR101
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- CR134C
- CR135
- CR135A
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- CR136A
- CR137
- CR137A
- CR137D
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- CR139A
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- CR140
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- CR141
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- CR141C
- CR142
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- CR146A
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- CR148A
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- CR152C
- CR152D
- CR152E
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- CR190A
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- CR191A
- CR191B