Working on curriculum. Here's an oldies but goody, if folks have time to
look.
>From PBS series Connections- episode 7 from Dutch trade ship to plastic
(if short of time and want to cut to the chase last section of last part
always summarizes) Includes development of artificial fertilizers. http://www.youtube.com/watch?v=Ij77k9GZLZs&feature=PlayList&p=9ED340614C8CBAF6&index=0&playnext=1