const r = await mn.api('/study-sets/' + topicid + '/notebooks');
mn.log(r);

{
  "topicid": "449C1665-E0DD-4A20-9E67-2B0D451F746D",
  "referenceNoteCount": 11,
  "bridgeApiVersion": "0.91",
  "items": [
    {
      "topicid": "B1F2A354-125A-4384-A271-C0B829AB9E09",
      "title": "The Quiet Case for Walkable Streets #1",
      "documents": [
        "ec280b8dbd77594d16b090165fdd4c07ec280b8dbd77594d16b090165fdd4c07"
      ]
    }
  ]
}