Safina, Carl. Population Trends, Habitat Utilization, and Outlook for the Future of the Sandhill Crane in North America: A Review and Synthesis.
Dickson, James G., Richard N. Conner, and J. Howard Williamson. Breeding Bird Community Changes in a Developing Pine Plantation.
North, Michael R. Distribution and Migration of Yellow-billed Loons in North America.
—————— Annual Reports of Major Avian Biomonitoring Programs Introduction to the 1990-91 Annual Reports.
Peterjohn, Bruce G. and John R. Sauer. North American Breeding Bird Survey Annual Summary 1990-1991.
DeSante, David F., Kenneth M. Burton, and Oriane E. Williams. The Monitoring Avian Productivity and Survivorship (MAPS) Program Second Annual Report (1990-1991).
Marchant, John, Lynette Musty, and Steve Carter. Common Bird Census: 1989-1990 Index Report.
Marchant , John and Lynette Musty. Common Bird Census: 1990-1991 Index Report.
Carter, Steve and Lynette Musty. Waterways Bird Survey: 1989-1990 Population Changes.
Carter, Steve and Lynette Musty. Waterways Bird Survey: 1990-1991 Population Changes.
Peach, Will and Stephen Baillie. Population Changes on Constant Effort Sites 1989-1990.
Peach, Will and Stephen Baillie. Population Changes on Constant Effort Sites 1990-1991.
Waters, Ray. Wintering Waders in the United Kingdom 1990-1991.
Waters, Ray. Wintering Waders in the United Kingdom 1991-1992.