Electronic books 12,879
Congresses 5,745
Periodicals 5,696
Conference papers and proceedings 4,565
Early works to 1800 4,139
History 2,974
Tables 2,378
Problems, exercises, etc 2,302
Internet videos 2,258
Early works 1,701
Problems and exercises 1,224
Textbooks 1,188
Dictionaries 1,069
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Bibliography 945
Thèses et écrits académiques 801
Biography 765
Electronic journals 711
Statistics 592
Popular works 590
Handbooks, manuals, etc 533
Tables (Data) 509
Instructional television programs 507
Formulae 483
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Congrès 457
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Périodiques 339
Bibliographies 331
Early works to 1900 306
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Study guides 282
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Examinations, questions, etc 219
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Manuscripts, English 78
Documentary films 73
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Interviews 70
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periodicals 65
Charts, diagrams, etc 64
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Records and correspondence 59
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Outlines, syllabi, etc 58
Association copies (Provenance) 56
Conference papers and proceedings 55
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