American Oystercatcher Population Monitoring Reports

Summary of 2011 census of American oystercatchers in Massachusetts

Massachusetts. Natural Heritage & Endangered Species Program. (Natural Heritage and Endangered Species Program, Massachusetts Division of Fisheries and Wildlife, 2012-12)
Summary of 2010 census of American oystercatchers in Massachusetts

Massachusetts. Natural Heritage & Endangered Species Program. (Natural Heritage and Endangered Species Program, Massachusetts Division of Fisheries and Wildlife, 2012-07)
Summary of 2009 census of American oystercatchers in Massachusetts

Massachusetts. Natural Heritage & Endangered Species Program. (Natural Heritage and Endangered Species Program, Massachusetts Division of Fisheries and Wildlife, 2010-07-30)