rdf-syntax-grammar
mods:
  schema location: http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
  title info:
    title: Proceedings, National Academy of Sciences of the United States of America
  title info:
    title: PROC. NATL. ACAD. SCI. USA
  type of resource: text
  genre: periodical
  origin info:
    place:
      place term: xxu
    place:
      place term: CHICAGO, ill
    publisher: NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
    date issued: 1957
    date issued: ####
    issuance: continuing
    frequency: Quincenal
  language:
    language term: eng
  subject:
    topic: CIENCIAS EN GENERAL
  identifier: 0027-8424
  record info:
    record creation date: 170703