نوع المادة
Electronic books
11,903
Congresses
9,755
Conference papers and proceedings
6,899
Periodicals
6,204
Biography
3,533
History
3,221
Congress
2,494
Biographies
2,245
Laboratory manuals
1,849
Periodical
1,631
Dictionaries
1,394
Classification
1,367
Electronic journals
1,183
Pictorial works
1,151
Guidebooks
1,142
Laboratory Manual
1,140
Laboratory Manuals
983
Bibliography
962
Juvenile literature
925
Handbooks, manuals, etc
886
Outdoor books
780
Early works to 1800
741
Early works
733
Pre-Linnean works
699
Handbooks and manuals
648
Bibliographies
627
Textbooks
603
Popular works
572
Périodiques
468
Aufsatzsammlung
453
Juvenile works
451
Périodiques
416
Catalogs
394
Academic theses
382
Autobiographies
348
Catalogs and collections
343
Correspondence
326
Computer network resources
303
congresses
286
Case studies
283
Electronic book
275
Thèses et écrits académiques
274
Congrès
272
Encyclopedias
265
Directories
264
periodicals
260
Illustrated works
248
Fulltext
246
Identification
237
Exhibitions
228
المزيد ...