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Electronic books
65
Libros electrónicos
54
Computer network resources
37
Periodicals
30
Electronic journals
29
Internet resources
12
Libros electronicos
8
Handbooks, manuals, etc
6
Périodiques
5
Outlines, syllabi, etc
4
Examinations
3
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3
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2
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2
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2
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2
Amateurs' manuals
1
Certification
1
Formulae
1
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1
Libros de texto
1
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1
Textbooks
1
periodika
1