Access to Digital Materials through the Library of Congress OPAC Presentation by Dr. Barbara B....

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!