Genre
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34
Periodicals
24
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19
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15
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11
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8
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8
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8
Handbooks and manuals
7
Technical reports
7
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6
Video recordings
4
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3
Literature
3
Pictures
3
Bibliographies
2
Case studies
2
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2
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2
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2
Abstracts
1
Academic theses
1
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1
Catalogs
1
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1
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1
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1
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1
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1
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1
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1
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1
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1
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1
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1
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1