00560nam a22001577a 450000500170000000800410001702000150005804000230007308200210009610000210011724501060013826000490024430000310029350400480032465000300037220211212170018.0211212b1981    usa||||| |||| 00| 0 eng d  a0395307694  aBD-DhBPAcBD-DhBPA  a305.23bWEC 1981  aWelton, David A.  aChildren and Their World: Strategies for Teaching Social Studies /cWelton, David A. & John T. Mallan  a Boston :bHoughton Mifflin Company ,c1981.  a492 p. ; :bill. ,c23 cm.  aInclude Bibliographical References & Index.  aYoung People in the World