Johnson, T. H. 2007 2006 Bald Eagle Monitoring in the Valles Caldera National Preserve
Johnson, T. H. 2007 2006 Bald Eagle Management Recommendations
Johnson, T. H. 2006 2005-2006 Bald Eagle Monitoring in the Valles Caldera National Preserve
Johnson, T. H. 2005 2004 Bald Eagle Monitoring in the Valles Caldera National Preserve
Johnson, T. H. 2004 2003 Bald Eagle Surveys in the Valles Caldera National Preserve
Johnson, T. H. 2003 2002 Bald Eagle Surveys in the Valles Caldera National Preserve
Johnson, T. H. 2002 2001 Raptor Surveys in the Valles Caldera National Preserve