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| English | Spanish |
| external and internal environment factors concerning the companies | factores externos e internos de índole ambiental que afectan a las empresas |
| internal coastal waters | agua interior del litoral |
| internal "Environmental Guidelines" manual | manual de uso interno "Directivas en materia de medio ambiente" |
| internal European market | mercado interior europeo |
| internal migration A population shift occurring within national or territorial boundaries, often characterized by persons seeking labor opportunities in more advantageous areas | migración interior |
| internal origin process | proceso de origen interno |
| internal standardization method | método por normalización interna |
| internal waste disposal site | vertedero interno |