| Termen/ Term | Nr. aparižii/ No. occurrences |
| CC:TETIS | 1 |
| CCALINESTI | 1 |
| CCHIRPAC | 1 |
| CDCLEJANI | 1 |
| CEACA | 1 |
| CEAUSU DE CIMPIE | 1 |
| CEDATA DE MUZEUL DE ARTA | 1 |
| CEDATA DE MUZEUL DE ARTA AL R.S.R. | 1 |
| CERTEGE | 1 |
| CHEITA | 1 |
| CHIRPAR | 1 |
| CIDELENI | 1 |
| CIMPIA MUNTENIEI | 1 |
| CIMPIA TIMISULUI | 3 |
| CIMPULUNG MOLDOVENESC | 1 |
| CINEPA | 4 |
| CIOLPANI | 1 |
| CIOPLIT | 1 |
| CIPERISANI | 1 |
| CIPETRICANI | 1 |
| CIUC | 1 |
| CIUC (?) | 1 |
| CIUCANU MARIA | 1 |
| CIUCSINGEORGIU | 1 |
| CJ | 1,867 |
| CL | 145 |
| CLUJ | 1 |
| COLECTIA BRAILOIU | 1 |
| COLECTIA CARPATINA | 16 |
| COLECTIA RICHTER | 105 |
| COLECTIA RICHTER DONATIE | 14 |
| COLECTIA RIHTER | 1 |
| COLECTIA VECHE A MUZEULUI | 2 |
| COLORANTI | 1 |
| COMANDAT LA MESTER | 1 |
| COMISIA | 1 |
| COMISIA DE ACHIZITII | 23 |
| COMISIE | 1 |
| CONSIGNATIE | 6 |
| CORABIA | 1 |
| CORHEANA | 1 |
| CORNEAREVA:HD | 1 |
| COROISINMARTIN | 1 |
| CORUND | 7 |
| COSTISA | 1 |
| COVASNA-HARGHITA | 2 |
| CRAIOVA | 1 |
| CRISTIORU DE JOS | 1 |
| CROSETAT | 1 |
| CS | 545 |