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diff --git a/tablib/packages/openpyxl/reader/style.py b/tablib/packages/openpyxl/reader/style.py
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+++ b/tablib/packages/openpyxl/reader/style.py
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+# file openpyxl/reader/style.py
+
+# Copyright (c) 2010 openpyxl
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+# THE SOFTWARE.
+#
+# @license: http://www.opensource.org/licenses/mit-license.php
+# @author: Eric Gazoni
+
+"""Read shared style definitions"""
+
+# package imports
+from openpyxl.shared.xmltools import fromstring, QName
+from openpyxl.shared.exc import MissingNumberFormat
+from openpyxl.style import Style, NumberFormat
+
+
+def read_style_table(xml_source):
+    """Read styles from the shared style table"""
+    table = {}
+    xmlns = 'http://schemas.openxmlformats.org/spreadsheetml/2006/main'
+    root = fromstring(xml_source)
+    custom_num_formats = parse_custom_num_formats(root, xmlns)
+    builtin_formats = NumberFormat._BUILTIN_FORMATS
+    cell_xfs = root.find(QName(xmlns, 'cellXfs').text)
+    cell_xfs_nodes = cell_xfs.findall(QName(xmlns, 'xf').text)
+    for index, cell_xfs_node in enumerate(cell_xfs_nodes):
+        new_style = Style()
+        number_format_id = int(cell_xfs_node.get('numFmtId'))
+        if number_format_id < 164:
+            new_style.number_format.format_code = \
+                    builtin_formats.get(number_format_id, 'General')
+        else:
+
+            if number_format_id in custom_num_formats:
+                new_style.number_format.format_code = \
+                        custom_num_formats[number_format_id]
+            else:
+                raise MissingNumberFormat('%s' % number_format_id)
+        table[index] = new_style
+    return table
+
+
+def parse_custom_num_formats(root, xmlns):
+    """Read in custom numeric formatting rules from the shared style table"""
+    custom_formats = {}
+    num_fmts = root.find(QName(xmlns, 'numFmts').text)
+    if num_fmts is not None:
+        num_fmt_nodes = num_fmts.findall(QName(xmlns, 'numFmt').text)
+        for num_fmt_node in num_fmt_nodes:
+            custom_formats[int(num_fmt_node.get('numFmtId'))] = \
+                    num_fmt_node.get('formatCode')
+    return custom_formats