Edumacate me on this...

What is the difference between BLM land, walk in land and Hunter Management Areas. I get the HMA...it's like our WMA and that's another permit and draw system to get into those. Walk-ins, not much info but I assume that's the public land I'd target for a DIY hunt? And BLM...that's something total different as it's not mentioned on the WY fish and game?