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| Source | |
| AC | General Directorate of Civil Aviation (Ministry of Public Works) |
| AEAT | State Tax Administration Agency (Ministry of Finance and Public Administration) |
| AEMET | Spanish State Meteorological Agency (Ministry of Agriculture, Food and Environment) |
| BE | Bank of Spain |
| CGPJ | General Council of the Judiciary Branch |
| CSD | Higher Sports Board (Ministry of Education, Culture and Sport) |
| CyT | Post Office |
| DGP | Police General Directorate (Home Office) |
| DGT | Spanish Traffic Authority (Home Office) |
| IET | Institute for Tourist Studies (Ministry of Industry, Energy and Tourism) |
| IGN | National Geographic Institute General Directorate (Ministry of Public Works) |
| INAEM | National Institute of Scenary Arts and Music (Ministry of Education, Culture and Sport) |
| INE | National Institute of Statistics (Ministry of Economy and Competitiveness) |
| ISCIII | Carlos III Institute of Health (Ministry of Economy and Competitiveness) |
| LAE | State Lotteries and Gaming |
| MAGRAMA | Ministry of Agriculture, Food and Environment |
| MCU | Ministry of Education, Culture and Sport |
| MD | Ministry of Defence |
| MEC | Ministry of Education, Culture and Sport |
| MEYSS | Ministry of Employment and Social Security |
| MFOM | Ministry of Public Works |
| MINETUR | Ministry of Industry, Energy and Tourism |
| MINHAP | Ministry of Finance and Public Administration |
| MIR | Home Office |
| MJU | Ministry of Justice |
| MSPS | Ministry of Health, Social Services and Equality |
| PE | Spanish Port System (Ministry of Public Works) |
| RN | General Directorate for Registers and Notaries (Ministry of Justice) |
| SEPE | Public Employment Service (Ministry of Health, Social Services and Equality) |
| SGAE | General Association of Writers and Publishers |
| SGIP | Secretariat General for Penitentiary Institutionsine (Home Office) |
| SS | Information from more than two sources |
| International sources | |
| FAO | Food and Agriculture Organization of the United Nations |
| ILO | International Labour Organization |
| ITU | International Telecommunication Union |
| OECD | Organisation for Economic Co-operation and Development |
| UN | United Nations |
| UNESCO | United Nations Educational, Scientific and Cultural Organization |
| WB | World Bank |
| WHO | World Health Organization |
| WTO | World Tourism Organization |
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