Genre
Electronic books
351
Congresses
154
Periodicals
44
Problems, exercises, etc
19
Electronic journals
16
Electronic book
10
Textbooks
7
Libros electronicos
6
Biography
5
Miscellanea
2
Computer network resources
1
Early works to 1800
1
Filmed lectures
1
Handbooks, manuals, etc
1
Popular works
1
Problemas, ejercicios, etc
1
Study guides
1