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    "nstc": null,
    "title": "De amateurspion in een heteluchtballon",
    "subtitle": null,
    "collection_title": "Detectivebureau Iris en Ko",
    "collection_part_number": "8",
    "annotation": "<p>Iris en Koos hebben een ballonvaart over het mooie Friese land gewonnen. Koos, altijd oplettend, luistert in de ballon een gesprek over onopgeloste diefstallen af. De oude boer Sikkema verdenkt de bewoners van het asielzoekerscentrum. Maar Koos heeft zijn vraagtekens en hij wil met Iris gaan uitzoeken hoe de vork in de steel zit. Natuurlijk is er niemand zo goed in uitzoeken hoe vorken in stelen zitten als Koos! Detectivebureau Iris en Ko komt weer in actie, maar boer Sikkema is daar niet blij mee ...</p>",
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    "language_code": "dut",
    "original_language_code": null,
    "page_count": 92,
    "duration_seconds": null,
    "publication_date_first": "2011-09-01",
    "publication_date_latest": "2011-09-01",
    "cover_url": null,
    "editions": [
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            "isbn": "9789085431558",
            "product_form": "BB"
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    "created_at": "2025-09-19T12:47:14+00:00",
    "updated_at": "2025-11-07T00:12:47+00:00",
    "publisher": {
        "id": 881,
        "slug": "uitgeversgroep-jongbloed",
        "name": "Uitgeversgroep Jongbloed",
        "created_at": "2025-09-19T12:30:42+00:00",
        "updated_at": "2025-09-19T15:11:31+00:00"
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    "contributors": [
        {
            "id": 101321,
            "slug": "bert-wiersema-2",
            "key_names": "Wiersema",
            "names_before_key": "Bert",
            "prefix_to_key": null,
            "contributor_role": "A01",
            "readable_contributor_role": "Author"
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    "genres": [],
    "subjects": [
        {
            "scheme_identifier": "32",
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            "created_at": "2025-09-19T12:47:14+00:00",
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