anchor.diff:    </div>
     <div class="field">
       <%= f.label :image_format %><br>
  -    <%= f.select(:image_format, MLOG_VOCAB["image_formats"].invert) %>
  +    <%= f.select(:image_format, MLOG_VOCAB["image_formats"].invert, :include_blank => true ) %>
   
     </div>
     <div class="field">
       <%= f.label :encoding_scheme %><br>
  -    <%= f.select(:encoding_scheme, MLOG_VOCAB["encoding_schemes"].invert) %>
  +    <%= f.select(:encoding_scheme, MLOG_VOCAB["encoding_schemes"].invert, :include_blank => true ) %>
     </div>
     <div class="field">
       <%= f.label :partition_table_format %><br>
  
positive.code:   </div>
    <div class="field">
      <%= f.label :interface %><br>
      <%= f.select(:interface, MLOG_VOCAB["interfaces"].invert) %>
    </div>
    <div class="field">
      <%= f.label :imaging_software %><br>
      <%= f.select(:imaging_software, MLOG_VOCAB["imaging_software"].invert) %>
    </div>
    <div class="field">
      <%= f.label :hdd_interface %><br>
      <%= f.select(:hdd_interface, MLOG_VOCAB["hdd_interfaces"].invert) %>
    </div>
    <div class="field">
      <%= f.label :imaging_success %><br>
  
negative.code: 
    <div class="field">
      <%= f.label :partner_code %><br>
      <%= f.select(:partner_code, MLOG_VOCAB["partner_codes"].invert, :include_blank => true ) %>
    </div>
    <div class="field">
      <%= f.label :collection_code %><br>
      <%= f.select(:collection_code, MLOG_VOCAB["collection_codes"].invert, :include_blank => true ) %> 
    </div>
    <div class="field">
      <%= f.label :accession_num %><br>
  