Johnson, T. H. 2003 Geophysical Spotted Owl Habitat Model for the Southwestern United States
Johnson, T. H. 2001 Test of the Low Resolution New Mexico Topographic Spotted Owl Habitat Model in the Southwestern US
Johnson, T. H. 2000 Status of the Spotted Owl in the Jemez Mountains–2000
Johnson, T. H. 1996 Topographic Model of Potential Spotted Owl Habitat in Northern New Mexico
Johnson, T. H. 1993 Topographic Model of Potential Spotted Owl Habitat in New Mexico