One of my former profs at UH, Steven Mintz, has created a wonderful resource for teachers and students, Digital History.
Follow this link to the Vietnam War teaching module, and review the chapter on maps. Check back in the next day or two for additional links, and an assignment.
In the meantime, some of you asked about chemical warfare during the Vietnam War, referred to by some as an example of "ecocide." Here's a website about agent orange and its effects, and several other sites with pictures of the effects of chemical warfare.
One. Two. Three. Four.
[Photo credit here.]