Walton, Richard K. and Robert W. Lawson

Backyard Bird Song
Eastern-Central Birding by Ear (Disc 1)
Eastern-Central Birding by Ear (Disc 2)
Eastern-Central Birding By Ear (Disc 3)
Eastern-Central More Birding by Ear (Disc 2)
Eastern-Central More Birding by Ear (Disc 3)
Eastern-Central MoreBirding by Ear (Disc 2)
Eastern/Central Birding by Ear
Eastern/Central More Birding by Ear
More Birding By Ear
More Birding By Ear, Disk 1
Western Birding by Ear (Disc 2)
Western Birding by Ear (Disc 3)