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1. Before 1958  (4,970)
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New Records 

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Subject 

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14. Electric Communication Technique  (31,860)
15. Educational Or Demonstration Appliances  (29,065)
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17. Appliances For Teaching, Or Communicating With, The Blind,deaf Or Mute  (29,065)
18. Diagrams  (29,065)
19. Globes  (29,065)
20. Electric Digital Data Processing  (27,309)
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Databases 

1. esp@cenet  (163,498)
2. Europeana Collections  (79)
3. ProQuest Central  (63)
4. DOAJ Directory of Open Access Journals  (31)
5. ROAD: Directory of Open Access Scholarly Resources  (27)
6. SpringerOpen  (16)
7. Sage Journals Open Access Journals  (10)
8. Digital Dissertations (Universitätsbibliothek der LMU Muenchen)  (7)
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10. DOAB: Directory of Open Access Books  (5)
11. OAPEN  (5)
12. Ebook Central - Academic Complete  (4)
13. Münchener DigitalisierungsZentrum (MDZ)  (4)
14. MADOC Publikationsserver  (4)
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16. SSOAR (Social Science Open Access Repository)  (3)
17. e-periodica  (3)
18. ZORA  (2)
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20. Walter De Gruyter: Open Access Journals  (2)
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Language 

1. English  (113,751)
2. French  (101,074)
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7. Latin  (2)
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1. Big Data & Society  (9)
2. Bulletin Of The Polish Academy Of Sciences. Technical Sciences  (5)
3. Computer Und Recht  (9)
4. Elektrotechnik Und Informationstechnik  (6)
5. Hmd Praxis Der Wirtschaftsinformatik  (11)
6. Hmd. Praxis Der Wirtschaftsinformatik  (11)
7. Informatik-Spektrum  (3)
8. Mathematica Slovaca  (4)
9. Mitteilungen Der Deutschen Mathematiker-Vereinigung  (7)
10. Mitteilungen Der Dmv  (8)
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