21

22

23

24

25

26

27 Subjects: “...population...”

28 Subjects: “...; movements, parties; agriculture, rural population, land reform, agrarian movements...”

29 Table of Contents: “...Series 1. Agriculture, embracing a view of the social condition of the rural population...”

30

31 “... applied to sparsely populated farmland, pesticides have been increasingly used in densely populated urban...”