نوع المادة
Textbooks
17
Handbooks, manuals, etc
14
Study guides
9
Amateurs' manuals
5
Handbooks
5
Outlines, syllabi, etc
4
Periodicals
4
Problems, exercises, etc
4
Examinations, questions, etc
3
Case studies
2
Charts, diagrams, etc
1
Databases
1
Design
1
Designs and plans
1
Dictionaries
1
Directories
1
Encyclopedias
1
Examination Questions
1
Guidebooks
1
Laboratory manuals
1
Problems and Exercises
1
Reference books
1
Statistics
1
Tables
1
Working drawings
1
handbooks
1