- Service letters - data transferors
- Letters of service - Local administration
- Letters of service from Via Oberta - Generalitat de Catalunya
- Service letters of Via Oberta - General Administration of the State
- Professional colleges
- DGT: municipal vehicle tax debtors (how to make inquiries)
- DGT: debtors of the IVTM (service sheet and requirements)
- Professional associations: technical documents (service sheet and requirements)
- Professional associations: technical documents (how to make inquiries)
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