def _extra_urls(entry):
    """Returns a dict of URL types to URLs, e.g.
       { 'nytimes': 'http://nytimes.com/story/about/research.html',
          ... }
    """
    urls = {}
    for k, v in entry.fields.items():
        k = k.lower()
        if not k.endswith('_url'):
            continue
        k = k[:-4]
        urltype = k.replace('_', ' ')
        urls[urltype] = v
    return urls