The following section outlines some specific types of maps that are specifically useful for research in environmental history.
Your question should be narrowed to a specific period.
resize=768:*" /" title="" src="data:image/gif;base64, R0l GODlh AQABAIAAAAAAAP///y H5BAEAAAAALAAAAAABAAEAAAIBRAA7" data-src="https://hips.hearstapps.com/cos.h-cdn.co/assets/cm/14/25/539fd5c26260a_-_cos-03-sexy-topless-woman-md.jpg?
It's kind of like going to a strip club: I was never the guy who got on the stage or threw money at the girls so that the whole club could watch her pick it up (to me, that's kind of what My Free Cams is like).
What I really enjoyed was looking around, watching the girls dance and then picking one girl to take into a private booth, away from prying eyes where I could sit back and have her all to myself.
Be clear in you research question before beginning to look for map evidence.
As one of the most useful research tools in environmental history, maps use vivid, visual information to tell vast stories about place, space, and time in a relatively small format.