SUBJECT
Science
13
Mathematics
11
Biology
7
Study and teaching
7
English language
5
Chemistry
4
Genetics
4
History
4
Physics
4
Readers
4
Textbooks for foreign speakers
4
Addresses, essays, lectures
3
Dictionaries
3
Experiments
3
Scientists
3
Study and teaching (Secondary)
3
Agricultural science principles
2
Arithmetic
2
Biography
2
Botany
2
Chemistry, Physical and theoretical
2
Embryology
2
Engineering
2
Environmental protection
2
Evolution
2
Examinations, questions
2
Human ecology
2
Human evolution
2
Medicine
2
Molecular biology
2
Philosophy
2
Problems, exercises
2
Problems, exercises, etc
2
Study and teaching (Primary)
2
Vertebrates
2
Workbook
2
Addresses, lectures, essays
1
Adolescent psychology
1
Algebra
1
Artist--Italy--Biography
1
Astronomy
1
Astrophysics
1
Biology--Experiments
1
Biology--Study and teaching
1
Biotechnology
1
Birth Control
1
Botany, Economic
1
Case studies
1
Chemical genetics
1
Chemistry, Inorganic
1
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