* Paarlberg, Don. ''The Agricultural Revolution of the 20th Century'' (2001) p 183 [http://books.google.com/books?id=7xYewA8coD4C&pg=PA128&dq=parity+1910-1914&lr=&as_drrb_is=q&as_minm_is=0&as_miny_is=&as_maxm_is=0&as_maxy_is=&num=30&as_brr=3#v=onepage&q=parity%201910-1914&f=false online] | * Paarlberg, Don. ''The Agricultural Revolution of the 20th Century'' (2001) p 183 [http://books.google.com/books?id=7xYewA8coD4C&pg=PA128&dq=parity+1910-1914&lr=&as_drrb_is=q&as_minm_is=0&as_miny_is=&as_maxm_is=0&as_maxy_is=&num=30&as_brr=3#v=onepage&q=parity%201910-1914&f=false online] |