Access to Digital Materials through the Library of Congress OPAC

Presentation byDr. Barbara B. Tillett

Chief, Cataloging Policy and Support OfficeLibrary of Congress

April 8, 2002Oslo, Norway

Contents

• OPAC links– Multiple manifestations

(holdings) • Subscriptions to ER

– Virtual collections • American Memory• LC online exhibits

– Selected Web sites• Web Preservation archive

– CORC/Dublin Core & MARC

– Digitization of originals• High use materials• Preservation• Digital delivery of ILL

– Page turners, “Query”

• OPAC or Web search– Tables of Contents

– Finding Aids/Reference Lists

• Internal (LC) viewers– Luna

– QuickTime, VMPEG, Real MediaPlayer

– RealAudio, Docuview, MrSID, LizardTech

Multiple Manifestations

Subscriptions to Electronic Resources

“Virtual Collections”

• American Memory

• LC Online Exhibits

• Etc.

Hot link

Inquery

Collection level recordwith hot link

Item level record

Online exhibitmultiple LC collections

1490-1920

Selected Web Sites

Web Preservation - Archive

Title

MINERVA

Mapping the Internet Electronic Resources

Virtual Archive

Web Preservation at the Library of Congress

To design, develop and execute a collecting program at the Library for born digital materials to be a permanent part of the research holdings

Multidisciplinary team created to study and evaluate methods of web preservation

To collect and preserve open-access materials from the web

Project Background and Goals

MINERVA – Mapping the Internet Electronic Resources Virtual Archive

Web site

ArchiveAt selected time intervals additional snapshots are made.

Snapshot 1

Snapshot 2

Snapshot 3

A web site is downloaded, using a mirroring program. A snapshot is stored in an archive.

Project Description Collect

Minerva screen shot

http://web.archive.org/collections/e2k.html

http://wayback.loc.gov:8081/collections/e2k.html

Election 2000: an Internet Library

http://september11.archive.org

September 11 Web Archive

Dublin Core and AACR/MARC

• CORC

Dublin Core

OCLC CORC

Digitization of Originals

• High use materials

• Preservation

• Digital delivery of ILL

For preservation

ForBrittle bookpreservation

For ILL

For ILL

Link back to OPAC

Linked Digital Tables of Contents

• Flat files

• Searchable on Internet (Web browsers)

• Links in OPAC

Links to and from Finding Aids and Reference Lists

TableofContents

SourcesCited

Index

Thomas Jefferson : An American Man for All Seasonshttp://www.loc.gov/rr/main/jefferson/

Links to dynamic

catalog searches

Internal Viewers

• http://memory.loc.gov/ammem/amviewer.html

LunaLizardTechQuickTimeVMPEGReal MediaPlayerReal AudioDocuviewMrSID

LUNA

LizardTech

Issues

• Ad hoc projects across LC

• Consistent policy - MPG

• Resolving URLs– 856 mix of URLs, handles, etc.

– Handles

• Impact on OPAC response time– Z39.50 searches - use limits

– Web (external) searches

– Internal searches

• End users’ technology

• Copyright

• Timing MARC format changes

• Staff resources– Keeping up with serial

aggregations (high volume, ephemeral)

– Bib record quality

• Communicating the existence of the digital resources

Future OPAC Icons

Prototype

Thank you!