diff --git a/README.md b/README.md
index 4c7726d..2dfdda7 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,15 @@
 # anzsic codes
+
 ANZSIC codes in a standard table format for people who are sick of ABS for sharing data in non-standard formats.
 
+
+## Data sources
+
+| Filename | Source | Downloaded date |
+|----------|----------|-------|
+| `data/1292.0.55.005_ anzsic 2006 - correspondence tables.xls`   | [Data 2](https://www.abs.gov.au/AUSSTATS/abs@.nsf/DetailsPage/1292.0.55.0052006?OpenDocument)   | 2024-10-23 |
+| `data/1292.0.55.002_anzsic 2006 - codes and titles.xls`   | [Data 4](https://www.abs.gov.au/AUSSTATS/abs@.nsf/DetailsPage/1292.0.55.0022006?OpenDocument)   | 2024-10-23 |
+
+
 # Known issues
 Please note that the 'nfd' (not further defined) classes are missing from the anzsic tables, as repoted by @baslat in https://github.com/asiripanich/anzsic/issues/1. PRs to fix are welcome. 
diff --git a/data/1292.0.55.002_anzsic 2006 - codes and titles.xls b/data/1292.0.55.002_anzsic 2006 - codes and titles.xls
new file mode 100644
index 0000000..daaadcc
Binary files /dev/null and b/data/1292.0.55.002_anzsic 2006 - codes and titles.xls differ
diff --git a/requirements.txt b/requirements.txt
index bff55aa..255032a 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,3 +1,4 @@
 polars==1.10.0
 pyarrow==17.0.0
-fastexcel==0.12.0
\ No newline at end of file
+fastexcel==0.12.0
+papermill==2.6.0
\ No newline at end of file
diff --git a/tidy.ipynb b/tidy.ipynb
new file mode 100644
index 0000000..76a7455
--- /dev/null
+++ b/tidy.ipynb
@@ -0,0 +1,139 @@
+{
+ "cells": [
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "import polars as pl\n",
+    "import polars.selectors as cs"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "def read_anzsic_sheet(sheet_name, prefix):\n",
+    "    df = (\n",
+    "        pl.read_excel(\n",
+    "            r\"data/1292.0.55.002_anzsic 2006 - codes and titles.xls\",\n",
+    "            sheet_name=sheet_name,\n",
+    "            drop_empty_rows=True,\n",
+    "        )\n",
+    "        .drop(cs.by_index(0))\n",
+    "        .select(cs.by_index(-2, -1))\n",
+    "        .with_columns(pl.all().fill_null(strategy=\"forward\"))\n",
+    "        .drop_nulls()\n",
+    "    )\n",
+    "    df.columns = [f\"{prefix}_code\", f\"{prefix}_title\"]\n",
+    "    df = df.unique(f\"{prefix}_title\", keep=\"first\", maintain_order=True).sort(\n",
+    "        f\"{prefix}_code\"\n",
+    "    )\n",
+    "    if prefix != \"division\":\n",
+    "        df = df.with_columns(\n",
+    "            pl.col(f\"{prefix}_code\").str.replace(r\".$\", \"\").alias(f\"{prefix}_parent\")\n",
+    "        )\n",
+    "    return df\n",
+    "\n",
+    "\n",
+    "anzsic06 = {\n",
+    "    sheet_name: read_anzsic_sheet(sheet_name, prefix)\n",
+    "    for sheet_name, prefix in zip(\n",
+    "        [\"Divisions\", \"Groups\", \"Classes\"], [\"division\", \"group\", \"class\"]\n",
+    "    )\n",
+    "}\n",
+    "\n",
+    "anzsic06"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "# Create Subdivisions\n",
+    "anzsic06[\"Subdivisions\"] = pl.read_excel(\n",
+    "    r\"data/1292.0.55.002_anzsic 2006 - codes and titles.xls\",\n",
+    "    sheet_name=\"Subdivisions\",\n",
+    "    drop_empty_rows=True,\n",
+    ").drop(cs.by_index(0))\n",
+    "\n",
+    "anzsic06[\"Subdivisions\"] = (\n",
+    "    anzsic06[\"Subdivisions\"]\n",
+    "    .with_columns(pl.all().fill_null(strategy=\"forward\"))\n",
+    "    .drop_nulls()\n",
+    ")\n",
+    "\n",
+    "anzsic06[\"Subdivisions\"].columns = [\n",
+    "    \"division_code\",\n",
+    "    \"subdivision_code\",\n",
+    "    \"subdivision_title\",\n",
+    "]\n",
+    "\n",
+    "anzsic06[\"Subdivisions\"] = (\n",
+    "    anzsic06[\"Subdivisions\"]\n",
+    "    .unique(\"subdivision_title\")\n",
+    "    .sort([\"division_code\", \"subdivision_code\"])\n",
+    ")\n",
+    "\n",
+    "anzsic06[\"Subdivisions\"]"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "anzsic06_combined = (\n",
+    "    anzsic06[\"Divisions\"]\n",
+    "    .join(anzsic06[\"Subdivisions\"], on=\"division_code\", how=\"full\")\n",
+    "    .join(\n",
+    "        anzsic06[\"Groups\"],\n",
+    "        left_on=\"subdivision_code\",\n",
+    "        right_on=\"group_parent\",\n",
+    "        how=\"full\",\n",
+    "    )\n",
+    "    .join(\n",
+    "        anzsic06[\"Classes\"], left_on=\"group_code\", right_on=\"class_parent\", how=\"full\"\n",
+    "    )\n",
+    "    .drop(cs.ends_with(\"parent\"), cs.ends_with(\"_right\"))\n",
+    ")"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "anzsic06_combined.write_csv(\"anzsic06.csv\")"
+   ]
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "anzsic",
+   "language": "python",
+   "name": "python3"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 3
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython3",
+   "version": "3.13.0"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 2
+}
diff --git a/tidy_anzsic.py b/tidy_anzsic.py
deleted file mode 100644
index 9f114b8..0000000
--- a/tidy_anzsic.py
+++ /dev/null
@@ -1,2 +0,0 @@
-import polars as pl
-