Genre
Congresses
39
Handbooks, manuals, etc
29
Periodicals
27
Case studies
10
Specifications
4
Bibliography
3
Electronic books
3
Study guides
3
Dictionaries
2
Periodicials
2
Biography
1
Cases
1
Catalogs
1
Examinations, questions, etc
1
Journals
1
Law and legislation
1
Records and correspondence
1
Safety regulations
1
Standards
1
Tables
1