How to Search

You can apply Boolean search logic to your keywords and terms, using AND, OR, NOT, and parentheses. You can also use specific indexes for your search terms.

Broaden Your Search

Put an upper-case OR between your keywords. For example, dust OR bowl retrieves records containing either dust or bowl.

Narrow Your Search

  • Put quotes around your keywords to find records with an exact phrase. For example, "dust bowl" retrieves records with the words dust and bowl together, but would not match a description where those two words were not adjacent and in that order.
  • Put an upper-case NOT between your keywords. For example, dust NOT bowl retrieves records containing dust, but not bowl.
  • Put a ~ and a number between 1 and 4 at the end of your exact phrase. For example, "dust bowl"~4 retrieves records where dust and bowl appear within four words of each other.
  • Put parentheses around your search terms. For example, (dust OR bowl) NOT oklahoma retrieves records containing either dust or bowl, but not Oklahoma.

Combining Indexes

Though you don't need to do anything special in your search if you are using the default "keyword" index, you can use more specific indexes for your search terms. For example, the search ("mark twain" OR "samuel clemens") NOT location:virginia will match descriptions that include the phrase Mark Twain or Samuel Clemens, and where the archival institution is not in Virginia.

Other Indexes

Metadata facets
  • title
    • For MARC records, based on the subfield values found in one title field, with these tags checked in this order (the first tag that has a value is used as the title): 130, 240, 245, 246, 730, 740.
    • For EAD finding aids, based on the value found in the archdesc/did/unittitle, else archdesc/did/titlestmt/titleproper, else archdesc/did/titleproper. For titleproper it favors those with a type attribute of "filing".
    • For HTML finding aids, the value is based on the HTML title element, or on the link title on the harvest site.
    • For PDF finding aids, the value is based on the PDF document title property or on the link title on the harvest site.
    • These varying sources for HTML and PDF titles are configured by OCLC Research for each contributor.
    • Example search: Search for title merriweather and title oral history
  • archive
    • Contains the name of the archival institution that holds the item or collection. The name is controlled in ArchiveGrid, based on a contributor data management system we use to build the index, to avoid typographic or other variations of the name that could appear in records from the same institution.
    • Example search: Search for archive buffalo
  • location
    • Contains the name of the location of the archival institution that holds the item or collection. The location name is controlled in ArchiveGrid, based on a contributor data management system we use to build the index, to avoid typographic or other variations of the name that could appear in records from the same institution.
    • Example search: Search for location virginia
  • person.name
    • For MARC records, based on field 100, 600, or 700. For EAD XML, from ead xml elements persname and famname if they have an encodinganalog attribute of 100, 600 or 700, or from subject if it has an encodinganalog attribute of 600. Not supported for HTML or PDF finding aids.
    • Example search: Search for person.name einstein
  • organization.name
    • For MARC records, based on fields 110, 610, or 710.
    • For EAD XML, from ead xml element corpname if it has an encodinganalog attribute of 110, 610, or 710, or from subject if it has an encoding analog of 610.
    • Not supported for HTML or PDF finding aids.
    • Example search: Search for organization.name research
  • topic.name
    • For MARC records, based on field 650.
    • For EAD XML, based on ead xml subject elements that have an encoding analog of 650.
    • Not supported for HTML or PDF finding aids.
    • Example search: Search for topic.name women education
  • place.name
    • For MARC records, based on field 651. This includes entries that are added by OCLC Research for FAST subject headings derived from LCSH headings in the record.
    • For EAD XML, from the ead geogname element and from ead subject with the encoding analog 651.
    • Not supported for HTML or PDF finding aids.
    • Example search: Search for place.name buffalo
  • event.name
    • For MARC records, based on fields 111, 611, or 711.
    • For EAD XML, from ead xml element corpname if it has an encodinganalog attribute of 111, 611, or 711, or from subject if it has an encoding analog of 611.
    • Not supported for HTML or PDF finding aids.
    • Example search: Search for event.name american civil war
Content type
  • has_links
    • Currently for MARC records only, the index is set to "1" if the record includes an 856 field subfield u with a value beginning with "http".
    • Example search: Search for has_links 1
  • type
    • A general index indicating the type of the source data. The current values are "marc" (for MARC bibliographic records from WorldCat), "ead" for EAD XML sources, "html" for HTML sources, and "pdf" for PDF sources.
    • Example search: Search for type ead
MARC Record Leader values and other control fields
  • More information about MARC Leader values and control fields can be found on the Library of Congress website.
  • recordtype
    • For MARC records only.
    • Represents the MARC Type of Record found in MARC Leader byte 6.
    • Example search: Search for recordtype k
  • biblevel
    • Represents the MARC Bibliographic Level value found in MARC Leader byte 7.
    • Also added with a default level of "c" for harvested EAD, HTML and PDF finding aids.
    • Example search: Search for biblevel d
  • control
    • For MARC records only.
    • Represents the MARC Type of Control value found in MARC leader byte 8.
    • Example search: Search for control a
  • catlevel
    • For MARC records only.
    • Represents the MARC Level of Cataloging value found in MARC leader byte 17.
    • Example search: Search for catlevel I
  • descconv
    • For MARC records only.
    • Represents the MARC descriptive conventions value found in MARC 040 subfield e.
    • Example search: Search for descconv DACS
  • oclc_symbol
  • mtype
    • For MARC records, represents the material type used to categorize records in OCLC Research.
    • Valid values are: book, file, intg, map, mixd, rcrd, scor, visu
    • Example search: Search for mtype mixd