You can download free map PDFs or buy maps from the USGS. To download them as a PDF that you can use on your desktop, laptop, tablet or phone go to http://store.usgs.gov/b2c_usgs/usgs/...a=%24ROOT)/.do
In the search box, type in WY and then zoom in until you can see the names of the areas. Type in a name of an area and when it comes up, click on the red balloon and a list of downloadable files will come up.
There is also software that is somewhat complicated to download and set up called TerraGo that will let you see layers. You might want to contact them for help on that but the PDFs as topo maps alone are useful.
I love carrying PDFs of the areas I'm hunting on my tablet and phone.