. . "The birds of eastern Pennsylvania and New Jersey, with introductory chapters on geological distribution and migration"@en . . . . . . . . "The birds of eastern Pennsylvania and New Jersey with introductory chapters on geographical distribution and migration"@en . . "The birds of eastern Pennsylvania and New Jersey"@en . . . . . . . . . "The birds of eastern Pennsylvania and New Jersey with introductory chapters on geographical distribution and migration, prepared under the direction of the Delaware Ornithological Club"@en . "The birds of eastern Pennsylvania and New Jersey with introductory chapters on geological distribution and migration"@en . "Birds of eastern pennsylvania and new jersey" . . "The birds of eastern Pennsylvania and New Jersey : with introductory chapters on geographical distribution and migration"@en . "The birds of eastern Pennsylvania and New Jersey : with introductory chapters on geographical distribution and migration, prepared under the direction of the Delaware Ornithological Club"@en . . .