old_contents: from collections import defaultdict
  
  from time import time
  from util import elapsed
  
  # things to set here:
  #       license, free_metadata_url, free_pdf_url
  # free_fulltext_url is set automatically from free_metadata_url and free_pdf_url
  
  def get_overrides_dict():
      override_dict = defaultdict(dict)
  
      # cindy wu example
      override_dict["10.1038/nature21360"]["free_pdf_url"] = "https://arxiv.org/pdf/1703.01424.pdf"
  
      # example from twitter
      override_dict["10.1021/acs.jproteome.5b00852"]["free_pdf_url"] = "http://pubs.acs.org/doi/pdfplus/10.1021/acs.jproteome.5b00852"
  
      # have the unpaywall example go straight to the PDF, not the metadata page
      override_dict["10.1098/rspa.1998.0160"]["free_pdf_url"] = "https://arxiv.org/pdf/quant-ph/9706064.pdf"
  
      # missed, not in BASE, from Maha Bali in email
      override_dict["10.1080/13562517.2014.867620"]["free_pdf_url"] = "http://dar.aucegypt.edu/bitstream/handle/10526/4363/Final%20Maha%20Bali%20TiHE-PoD-Empowering_Sept30-13.pdf"
  
      # otherwise links to figshare match that only has data, not the article
      override_dict["10.1126/science.aaf3777"]["free_pdf_url"] = None
      override_dict["10.1126/science.aaf3777"]["free_metadata_url"] = None
  
      #otherwise links to a metadata page that doesn't have the PDF because have to request a copy: https://openresearch-repository.anu.edu.au/handle/1885/103608
      override_dict["10.1126/science.aad2622"]["free_pdf_url"] = "https://lra.le.ac.uk/bitstream/2381/38048/6/Waters%20et%20al%20draft_post%20review_v2_clean%20copy.pdf"
  
      # otherwise led to http://www.researchonline.mq.edu.au/vital/access/services/Download/mq:39727/DS01 and authorization error
      override_dict["10.1111/j.1461-0248.2008.01185.x"]["free_pdf_url"] = None
  
      # override old-style webpage
      override_dict["10.1210/jc.2016-2141"]["free_pdf_url"] = "https://academic.oup.com/jcem/article-lookup/doi/10.1210/jc.2016-2141"
      override_dict["10.1210/jc.2016-2141"]["evidence"] = "hybrid manual"
  
      # not indexing this location yet, from @rickypo
      override_dict["10.1207/s15327957pspr0203_4"]["free_pdf_url"] = "http://www2.psych.ubc.ca/~schaller/528Readings/Kerr1998.pdf"
      # also, work around broken url extraction from sage
      override_dict["10.1207_s15327957pspr0203_4"]["free_pdf_url"] = "http://www2.psych.ubc.ca/~schaller/528Readings/Kerr1998.pdf"
  
      return override_dict
  
new_contents: from collections import defaultdict
  
  from time import time
  from util import elapsed
  
  # things to set here:
  #       license, free_metadata_url, free_pdf_url
  # free_fulltext_url is set automatically from free_metadata_url and free_pdf_url
  
  def get_overrides_dict():
      override_dict = defaultdict(dict)
  
      # cindy wu example
      override_dict["10.1038/nature21360"]["free_pdf_url"] = "https://arxiv.org/pdf/1703.01424.pdf"
  
      # example from twitter
      override_dict["10.1021/acs.jproteome.5b00852"]["free_pdf_url"] = "http://pubs.acs.org/doi/pdfplus/10.1021/acs.jproteome.5b00852"
  
      # have the unpaywall example go straight to the PDF, not the metadata page
      override_dict["10.1098/rspa.1998.0160"]["free_pdf_url"] = "https://arxiv.org/pdf/quant-ph/9706064.pdf"
  
      # missed, not in BASE, from Maha Bali in email
      override_dict["10.1080/13562517.2014.867620"]["free_pdf_url"] = "http://dar.aucegypt.edu/bitstream/handle/10526/4363/Final%20Maha%20Bali%20TiHE-PoD-Empowering_Sept30-13.pdf"
  
      # otherwise links to figshare match that only has data, not the article
      override_dict["10.1126/science.aaf3777"]["free_pdf_url"] = None
      override_dict["10.1126/science.aaf3777"]["free_metadata_url"] = None
  
      #otherwise links to a metadata page that doesn't have the PDF because have to request a copy: https://openresearch-repository.anu.edu.au/handle/1885/103608
      override_dict["10.1126/science.aad2622"]["free_pdf_url"] = "https://lra.le.ac.uk/bitstream/2381/38048/6/Waters%20et%20al%20draft_post%20review_v2_clean%20copy.pdf"
  
      # otherwise led to http://www.researchonline.mq.edu.au/vital/access/services/Download/mq:39727/DS01 and authorization error
      override_dict["10.1111/j.1461-0248.2008.01185.x"]["free_pdf_url"] = None
  
      # override old-style webpage
      override_dict["10.1210/jc.2016-2141"]["free_pdf_url"] = "https://academic.oup.com/jcem/article-lookup/doi/10.1210/jc.2016-2141"
      override_dict["10.1210/jc.2016-2141"]["evidence"] = "hybrid manual"
  
      # not indexing this location yet, from @rickypo
      override_dict["10.1207/s15327957pspr0203_4"]["free_pdf_url"] = "http://www2.psych.ubc.ca/~schaller/528Readings/Kerr1998.pdf"
      # also, work around broken url extraction from sage
      override_dict["10.1207_s15327957pspr0203_4"]["free_pdf_url"] = "http://www2.psych.ubc.ca/~schaller/528Readings/Kerr1998.pdf"
  
      # mentioned in world bank as good unpaywall example
      override_dict["10.3386/w23298"]["free_pdf_url"] = "https://economics.mit.edu/files/12774"
      return override_dict
  
subject: add world bank example