| Original title | Nueve cartas a Berta |
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| Danish title | Ni breve fra Berta |
| International titles | Nine letters to Bertha |
| Leikstjórn | Basilio M. Patino |
| Screenplay | Basilio M. Patino |
| Producer | Jose Antonio Zaplana |
| Director of Photography | Luis Enrique Toran |
| Editor | Pedro del Rey |
| Composer | Carmelo A. Bernaola |
| Appearance | Emilio G. Gaba, Mary Carrillo, Elsa Baeza |
| Land | Spanien |
| Technical info | 35 mm, Widescreen, Farve, Tone |
| TV release | 29.07.1969, DR |
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| Production company | SA ECO Film |
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Instruktion |
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| Instruktion | Basilio M. Patino |
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Manus |
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| Manus | Basilio M. Patino |
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Produktion |
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| Producer | Jose Antonio Zaplana |
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Foto |
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| Foto | Luis Enrique Toran |
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Klip |
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| Klip | Pedro del Rey |
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Musik |
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| Musik | Carmelo A. Bernaola |
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Medvirkende |
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| Medvirkende | Emilio G. Gaba |
| Medvirkende | Mary Carrillo |
| Medvirkende | Elsa Baeza |
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