Search for: Title Author Subject Series that begins with: 10 20 30 50 100 per page < Previous 10 Headings Next 10 Headings > Browse Headings # Agriculture -- Economic aspects -- Mathematical models 5 Agriculture -- Economic aspects -- Mexico 3 Agriculture -- Economic aspects -- Mexico -- Chiapas. 1 Agriculture -- Economic aspects -- Middle West. 4 Agriculture -- Economic aspects -- Middle West -- Case studies. 1 Agriculture -- Economic aspects -- Middle West -- History -- 20th century. 2 Agriculture -- Economic aspects -- Middle West -- History -- Congresses. 2 Agriculture -- Economic aspects -- Minnesota. 1 Agriculture -- Economic aspects -- Minnesota -- History -- 19th century. 1 Agriculture -- Economic aspects -- Missouri. 1 10 20 30 50 100 per page < Previous 10 Headings Next 10 Headings >