| Original title | Valley of mystery |
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| Danish title | Den mystiske dal |
| Leikstjórn | Josef Leytes |
| Screenplay | Richard Neal, Lowell Barrington |
| Based on | Efter en story af Richard Neal & Larry Marcus |
| Director of Photography | Walter Strenge |
| Editor | Gene Milford |
| Composer | Jack Elliott |
| Appearance | Richard Egan, Peter Graves, Joly Baker |
| Land | USA |
| Domestic distribution | ASA |
| Technical info | 35 mm, Normal, Technicolor, Tone |
| Danish theatrical release | 08.01.1968 |
| Cinemas | Colosseum |
| Danish rating | Forbudt for børn u. 16 år (1935-1969) |
Companies |
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| Production company | Universal Studios |
| Domestic distribution | ASA |
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Instruktion |
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| Instruktion | Josef Leytes |
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Manus |
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| Manus | Richard Neal |
| Manus | Lowell Barrington |
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Produktion |
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| Produktion | Harry Tatelman |
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Foto |
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| Foto | Walter Strenge |
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Klip |
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| Klip | Gene Milford |
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Musik |
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| Musik | Jack Elliott |
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Medvirkende |
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| Medvirkende | Richard Egan |
| Medvirkende | Peter Graves |
| Medvirkende | Joly Baker |
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