. . "Social-studies skills with Individual self-testing key"@en . . . "Social-studies skills, with Individual self-testing key"@en . "Social-studies skills, with Individual self-testing key" . . . . . . . . . . . . . . . "Social-studies skills" . "Social-studies skills : with individual self-testing key"@en . "Social-studies skills with individual self-testing key"@en . . "Social studies skills with individual self-testing key" . "Social studies skills with individual self-testing key"@en . . . . . . . . "Social studies skills, with Individual self-testing key"@en . . .