Library Gazette

More on HathiTrust overlap

Saturday, May 7, 2011 5:52 am

For those who are interested, here are some more data that focus on the location and date distribution of matched titles.

Distribution of publication dates

Distribution of location of matched books

location_name count(location_name)
Cambria Press 1
Director’s Office 1
Docs Librarian’s Office 1
ER Librarian’s Office 1
ITC Collection 1
Philosophy 1
Romance 1
TLC 1
Gale Virtual Ref Library 2
Honors 2
Mandelbaum Reading Room 2
Microtext-NCDocs 2
Nicaragua 2
PROBLEM 2
Art Slide Library 3
Cataloging 3
MOBWIL 3
Lion American Poetry 4
STR 4
Documents Index Table 5
Documents Ref. Desk 5
PDK 5
ACQUISITIONS 6
Mathematics & Computer 7
Theatre in video 9
SYS 10
Career 15
Ebooks from Netlibrary 15
Preservation 16
Reference Website 16
Chemistry 18
Media Collection 19
Classical Music Library 24
Reference Desk 25
NC Documents 27
Physics 33
Reference Office 34
Psychology 36
TECHSERV 41
PERSONAL ORDERS 58
Vienna 80
Documents CD-ROM 86
Browsing 108
University Archives 114
Physical Education 117
NA Wom Letters / Diaries 118
Music 150
CAGE 153
Microtext 192
Oversized 204
Reserve Book 300
Microtext-USDocs 365
Documents Website 367
VEN 383
LONDON 462
SPIL 462
Anthropology 553
RARE 627
Periodicals, Main Stacks 1027
Baptist 1314
Discarded 1383
Education 1437
Military Science 1663
Periodicals, Current 1767
Off-Site Shelving 2578
Ebook Library (Demand Dr) 2672
Reference 4106
Documents 11691
WEB 13898
Circulating main stacks 317687

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How much overlap do we have with the HathiTrust?

Friday, May 6, 2011 5:51 pm

Since ZSR library started looking at the HathiTrust as a potential source of out-of-copyright electronic texts people have been asking ‘how does our collection compare to HT?’ The short answer is (based on comparison of valid OCLC numbers) 366,800 out of 8.5 Million titles, or about 29% of our collection, slightly less than was recently indicated as an average coverage for research libraries in general. Granted, this is a simple first pass using OCLC number and is most likely leaving out a number of titles. It is interesting to note that out of 1.5M entries of 035A records in our database, nearly a third contain numbers that are not OCLC numbers.

A second question that has been raised is “What is the copyright status of these matched titles?” Unfortunately, over 87% of our matched titles are in copyright. This means that while they are digitized we can’t use them. Our matching process found only a 11% match of public domain titles (out of a database of 2.2M public domain records in the HathiTrust). This indicates that there are some good opportunities to expand our representation of public domain digitized resources in our catalog. As you might expect however, our MARC records for public domain resources also happen to be more likely to not have OCLC numbers. For instance, our Eighteenth Century Collections Online MARC records do not have OCLC numbers. For the rest of the codes listed in the table below you can visit the HathiTrust site.

This comparison is just our first guess at matching with the HathiTrust. HT includes some sophisticated data APIs and a wide range of identifiers that we can work with to see how our holdings compare. What we do about this is an open topic but I thought that it might be interesting to see initially how our collection compared.

Want to see the data? I can export the matches for you so you can run your own reports. Curious about the process? Visit my office and I can show you the database that was used to run the comparisons.

Table of copyright policy for matched titles

rights Number of records % of matched records
Cc-by 2 0.0005%
Cc-by-nc 16 0.0044%
Cc-by-nc-n 1 0.0003%
cc-by-nc-s 24 0.0065%
ic 320274 87.1446%
nobody 31 0.0084%
opb 137 0.0373%
pd 32100 8.7342%
pdus 9489 2.5819%
und 4809 1.3085%
world 637 0.1733%
Total matches 367520 100.0000%

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