app/views/catalog/_marc_view.html.erb
<div id="marc_view" class="modal-body marc-view">
<% fields = document.to_marc.select { |f| ('000'..'999') === f.tag } %>
<div class="field"><%= t('blacklight.search.librarian_view.leader', leader: document.to_marc.leader) %></div>
<%- fields.each do |field| -%>
<%- unless field.tag.to_s == "940" -%>
<div class="field">
<div class="tag-ind">
<span class="tag">
<%= h(field.tag) %>
</span>
<%- if field.is_a?(MARC::ControlField) -%>
<span class="control_field_values">
<%= h(field.value) %>
</span>
<%- else -%>
<div class="ind1">
<%= field.indicator1.presence || ' '.html_safe -%>
</div>
<div class="ind2">
<%= field.indicator2.presence || ' '.html_safe -%>
</div>
</div>
<div class="subfields">
<%- field.each do |sub| -%>
<span class="sub_code"><%= h(sub.code) %>|</span> <%= h(sub.value) %>
<%- end -%>
<%- end -%>
</div>
</div>
<%- end -%>
<%- end -%>
</div>