Here's a map from David Ramsey Map Collection that you will find Muldoon, Idaho. http://www.davidrumsey.com/luna/servlet/detail/RUMSEY~8~1~30...
You will need to pan the map larger to view it better. Go to the middle of the state until you find Hailey, Idaho. Once you have found it look to the right of Hailey and to the left of Martin. You'll find Muldoon in the center. Hope this helps.