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Below is a list of fields on HathiTrust MARC-XML files, by percentage of coverage. This data was processed using public APIs, so the code may help you understand the Hathifiles and HathiTrust Bibliographic API.
| Percentage | 100 | SYSTEM CONTROL NUMBER (R) |
| 245 |
100 | 100 | | SYSTEM DETAILS NOTE (R) |
| 974 |
100100100100100 | 100 | 99.681 | | PUBLICATION, DISTRIBUTION, ETC. (IMPRINT) (R) |
| 300 |
98.971 | PHYSICAL DESCRIPTION (R) |
| 040 |
95.834 | | CATALOGING SOURCE (NR) |
| 100 |
73.913 | | MAIN ENTRY--PERSONAL NAME (NR) |
| 650 |
64.913 | SUBJECT ADDED ENTRY--TOPICAL TERM (R) |
| 010 |
51.468 | | LIBRARY OF CONGRESS CONTROL NUMBER (NR) |
| 050 |
47.174 | | LIBRARY OF CONGRESS CALL NUMBER (R) |
| 500 |
38.91136.012 | | BIBLIOGRAPHY, ETC. NOTE (R) |
| 020 |
34.879 | | INTERNATIONAL STANDARD BOOK NUMBER (R) |
| 490 |
28.97227.899 | ADDED ENTRY--PERSONAL NAME (R) |
| 043 |
27.784 | | GEOGRAPHIC AREA CODE (NR) |
| 090 |
27.604 | | LOCAL CALL NUMBER (BK AM CF MP MU VM SE) [OBSOLETE] |
| 090 |
27.604 | | SHELF LOCATION (AM)[OBSOLETE] |
| 082 |
20.216 | | DEWEY DECIMAL CLASSIFICATION NUMBER (R) |
| 651 |
19.915 | | SUBJECT ADDED ENTRY--GEOGRAPHIC NAME (R) |
| 250 |
18.072 | 14.503 | ADDED ENTRY--CORPORATE NAME (R) |
| 600 |
14.061 | SUBJECT ADDED ENTRY--PERSONAL NAME (R) |
| 049 |
8.7338.355 | | ALTERNATE GRAPHIC REPRESENTATION (R) |
| 042 |
8.061 | | AUTHENTICATION CODE (NR) |
| 041 |
7.3617.092 | MAIN ENTRY--CORPORATE NAME (NR) |
| 246 |
6.558 | | VARYING FORM OF TITLE (R) |
| 610 |
5.859 | SUBJECT ADDED ENTRY--CORPORATE NAME (R) |
| 740 |
5.814 | ADDED ENTRY--UNCONTROLLED RELATED/ANALYTICAL TITLE (R) |
| 505 |
5.075 | | FORMATTED CONTENTS NOTE (R) |
| 015 |
4.986 | | NATIONAL BIBLIOGRAPHY NUMBER (R) |
| COM |
4.3694.35 | 4.179 | 3.33 | 3.309 | | DATES OF PUBLICATION AND/OR SEQUENTIAL DESIGNATION (R) |
| 086 |
2.796 | | GOVERNMENT DOCUMENT CLASSIFICATION NUMBER (R) |
| 546 |
2.752.697 | CHARACTER SETS PRESENT (NR) |
| 310 |
1.905 | | CURRENT PUBLICATION FREQUENCY (NR) |
| 776 |
1.895 | ADDITIONAL PHYSICAL FORM ENTRY (R) |
| 025 |
1.89 | | OVERSEAS ACQUISITION NUMBER (R) |
| 074 |
1.819 | 1.739 | 1.59 | | LOCAL NOTE (BK CF MP MU SE VM MX) [OBSOLETE] |
| 590 |
1.59 | RECEIPT DATE NOTE (VM) [OBSOLETE] |
| 690 |
1.5841.579 | TIME PERIOD OF CONTENT (NR) |
| 022 |
1.503 | | INTERNATIONAL STANDARD SERIAL NUMBER (R) |
| 111 |
1.475 | | MAIN ENTRY--MEETING NAME (NR) |
| 060 |
1.457 | NATIONAL LIBRARY OF MEDICINE CALL NUMBER (R) |
| 072 |
1.447 | | SUBJECT CATEGORY CODE (R) |
| 530 |
1.338 | | ADDITIONAL PHYSICAL FORM AVAILABLE NOTE (R) |
| 019 |
1.3021.289 | ADDED ENTRY--UNIFORM TITLE (R) |
| 016 |
1.237 | | NATIONAL BIBLIOGRAPHIC AGENCY CONTROL NUMBER (R) |
| 630 |
1.219 | SUBJECT ADDED ENTRY--UNIFORM TITLE (R) |
| 048 |
1.13 | NUMBER OF MUSICAL INSTRUMENTS OR VOICES CODE (R) |
| 037 |
1.111 | | SOURCE OF ACQUISITION (R) |
| 780 |
1.081 | 1.08 | 1.042 | 1.042 | 1.0330.987 | | MAIN ENTRY--UNIFORM TITLE (NR) |
| 785 |
0.971 | 0.9630.883 | 0.872 | 0.8220.758 | | NUMBERING PECULIARITIES NOTE (R) |
| 550 |
0.7330.705 | INDEX TERM--GENRE/FORM (R) |
| 210 |
0.5790.539 | 0.522 | | LINKING ENTRY COMPLEXITY NOTE (R) |
| 711 |
0.492 | ADDED ENTRY--MEETING NAME (R) |
| 070 |
0.457 | | NATIONAL AGRICULTURAL LIBRARY CALL NUMBER (R) |
| 012 |
0.448 | 0.4410.43 | | ADDED ENTRY--HIERARCHICAL PLACE NAME (R) |
| 793 |
0.414 | 0.388 | PRICE (NR) (BK AM CF MU VM SE) [OBSOLETE] |
| 830 |
0.369 | SERIES ADDED ENTRY--UNIFORM TITLE (R) |
| 510 |
0.362 | | CITATION/REFERENCES NOTE (R) |
| 653 |
0.339 | INDEX TERM--UNCONTROLLED (R) |
| 850 |
0.319 | | HOLDING INSTITUTION (R) |
| 321 |
0.306 | | FORMER PUBLICATION FREQUENCY (R) |
| 096 |
0.281 | 0.28 | CLASSIFICATION NUMBERS ASSIGNED IN CANADA (R) |
| 024 |
0.268 | | OTHER STANDARD IDENTIFIER (R) |
| 247 |
0.253 | 0.249 | | OTHER CLASSIFICATION NUMBER (R) |
| 263 |
0.248 | | PROJECTED PUBLICATION DATE (NR) |
| 265 |
0.219 | | SOURCE FOR ACQUISITION/SUBSCRIPTION ADDRESS (NR) [OBSOLETE] |
| 030 |
0.210.202 | | ELECTRONIC LOCATION AND ACCESS (R) |
| 611 |
0.192 | SUBJECT ADDED ENTRY--MEETING NAME (R) |
| 648 |
0.169 | SUBJECT ADDED ENTRY--CHRONOLOGICAL TERM (R) |
| 051 |
0.137 | LIBRARY OF CONGRESS COPY, ISSUE, OFFPRINT STATEMENT (R) |
| 039 |
0.131 | 0.126 | MUSICAL PRESENTATION STATEMENT (NR) |
| 787 |
0.122 | OTHER RELATIONSHIP ENTRY (R) |
| 525 |
0.118 | 0.117 | | CUMULATIVE INDEX/FINDING AIDS NOTE (R) |
| 069 |
0.1040.102 | 0.101 | 0.10.088 | | FUNDING INFORMATION NOTE (R) |
| 891 |
0.082 | 0.073 | POSTAL REGISTRATION NUMBER (R) |
| 534 |
0.068 | | ORIGINAL VERSION NOTE (R) |
| 775 |
0.064 | | OTHER EDITION ENTRY (R) |
| 079 |
0.0630.063 | SERIES ADDED ENTRY--CORPORATE NAME (R) |
| 047 |
0.062 | | FORM OF MUSICAL COMPOSITION CODE (R) |
| 773 |
0.062 | 0.061 | 0.058 | | SERIES STATEMENT/ADDED ENTRY--CORPORATE NAME (R) [US-LOCAL] |
| 772 |
0.051 | | SUPPLEMENT PARENT ENTRY (R) |
| 770 |
0.05 | | SUPPLEMENT/SPECIAL ISSUE ENTRY (R) |
| 306 |
0.0470.0470.041 | CARTOGRAPHIC MATHEMATICAL DATA (R) |
| 561 |
0.04 | | OWNERSHIP AND CUSTODIAL HISTORY (R) |
| 583 |
0.04 | 0.0380.036 | UNIVERSAL DECIMAL CLASSIFICATION NUMBER (R) |
| 599 |
0.036 | 0340.| 034 | CODED CARTOGRAPHIC MATHEMATICAL DATA (R) |
| 052 |
0.033 | GEOGRAPHIC CLASSIFICATION (R) |
| 046 |
0.032 | | SPECIAL CODED DATES (R) |
| 541 |
0.031 | | IMMEDIATE SOURCE OF ACQUISITION NOTE (R) |
| 242 |
0.03 | TRANSLATION OF TITLE BY CATALOGING AGENCY (R) |
| 503 |
0.025 | | BIBLIOGRAPHIC HISTORY NOTE (R) (BK CF MU) [OBSOLETE] |
| 540 |
0.025 | | TERMS GOVERNING USE AND REPRODUCTION NOTE (R) |
| 027 |
0.024 | | STANDARD TECHNICAL REPORT NUMBER (R) |
| 760 |
0.023 | 0.022 | 0.0220.021 | RESTRICTIONS ON ACCESS NOTE (R) |
| 797 |
0.02 | 0.018 | FORMER TITLE COMPLEXITY NOTE (R) |
| 777 |
0.018 | 0.017 | | TARGET AUDIENCE NOTE (R) |
| 588 |
0.017 | | SOURCE OF DESCRIPTION NOTE (R) |
| 212 |
0.016 | | VARIANT ACCESS TITLE (R) [OBSOLETE] |
| 691 |
0.0150.0140.014 | TEXTUAL HOLDINGS--BASIC BIBLIOGRAPHIC UNIT (R) |
| 570 |
0.01 | | EDITOR NOTE (SE) (R) [OBSOLETE] |
| 513 |
0.009 | | TYPE OF REPORT AND PERIOD COVERED NOTE (R) |
| 765 |
0.009 | ORIGINAL LANGUAGE ENTRY (R) |
| 840 |
0.009 | | SERIES ADDED ENTRY--TITLE (R) [OBSOLETE] |
| 790 |
0.006 | 0.006 | VARIANT PERSONAL NAME (SE) [OBSOLETE] |
| 044 |
0.005 | COUNTRY OF PUBLISHING/PRODUCING ENTITY CODE (NR) |
| 796 |
0.005 | 0.004 | LINKING LIBRARY OF CONGRESS CONTROL NUMBER (NR) [OBSOLETE] |
| 017 |
0.004 | COPYRIGHT OR LEGAL DEPOSIT NUMBER (R) |
| 264 |
0.004 | | PRODUCTION, PUBLICATION, DISTRIBUTION, MANUFACTURE, AND COPYRIGHT NOTICE (R) |
| 400 |
0.004 | | SERIES STATEMENT/ADDED ENTRY--PERSONAL NAME (R) [US-LOCAL] |
| 524 |
0.004 | | PREFERRED CITATION OF DESCRIBED MATERIALS NOTE (R) |
| 563 |
0.004 | | BINDING INFORMATION (R) |
| 871 |
0.004 | | VARIANT CORPORATE NAME (SE) [OBSOLETE] |
| SID |
0.0040.003 | | SERIES STATEMENT/ADDED ENTRY--MEETING NAME (R) [US-LOCAL] |
| 511 |
0.003 | | PARTICIPANT OR PERFORMER NOTE (R) |
| 518 |
0.003 | DATE/TIME AND PLACE OF AN EVENT NOTE (R) |
| 539 |
0.003 | 0.003 | 0.003 | SERIES ADDED ENTRY--PERSONAL NAME (R) |
| 890 |
0.003 | 0.0030.002 | MUSICAL INCIPITS INFORMATION (R) |
| 522 |
0.002 | GEOGRAPHIC COVERAGE NOTE (R) |
| 595 |
0.002 | 0.002 | 0.002 | ADDED ENTRY--UNCONTROLLED NAME (R) |
| 767 |
0.002 | 0.002 | | CONSTITUENT UNIT ENTRY (R) |
| 859 |
0.0020.002 | | FOREIGN MARC INFORMATION FIELD (R) |
| 033 |
0.001 | | DATE/TIME AND PLACE OF AN EVENT (R) |
| 091 |
0.001 | MICROFILM SHELF LOCATION (AM) [OBSOLETE] |
| 105 |
0.0010.001 | 0.001 | COLLECTIVE UNIFORM TITLE (NR) |
| 318 |
0.001 | 0.001 | 0.001 | 0.0010.001 | 0.001 | | TYPE OF COMPUTER FILE OR DATA NOTE (R) |
| 545 |
0.001 | | BIOGRAPHICAL OR HISTORICAL DATA (R) |
| 562 |
0.001 | | COPY AND VERSION IDENTIFICATION NOTE (R) |
| 585 |
0.001 | 0.0010.001 | | SERIES ADDED ENTRY--MEETING NAME (R) |
| 853 |
0.001 | CAPTIONS AND PATTERN--BASIC BIBLIOGRAPHIC UNIT (R) |
| 865 |
0.001 | ENUMERATION AND CHRONOLOGY--INDEXES (R) |