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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!