29 1 50 Additional Author Fowler, George W. Additional Author mixed material New York The Iroquois Publishing Company 1952 Additional Author - Additional Author mixed material London Grolier International 1962 Additional Author - Additional Author mixed material London Grolier International 1962 Additional Author - Additional Author mixed material London Grolier International 1962 Additional Author - Additional Author mixed material London Grolier International 1962 Additional Author - Additional Author mixed material London Grolier International 1962 Additional Author - Additional Author mixed material London Grolier International 1962 Additional Author - Additional Author mixed material London Grolier International 1962 Additional Author Krauskope, Konrad B. Additional Author mixed material 0072509791 New York McGraw-Hill 2006 Additional Author Taylor, Mary Amanda Additional Author mixed material New York Doubleday & Company 1955 Additional Author Raphael, Mary Additional Author mixed material New York Doubleday & Company 1955 Additional Author Raphael, Mary Additional Author mixed material New York Doubleday & Company 1955 Additional Author Hunter II, Maxwell W. Additional Author mixed material 138220116 New York Holt,Rinehart and Winston 1966 Additional Author Hymoff, Edward Additional Author mixed material 138700116 New York Holt Rinehart and Winston 1966 Additional Author Widger Jr,William K. Additional Author mixed material 193960116 New York Holt Rinehart and Winston 1966 Additional Author Gardner, Marjorie H. Additional Author mixed material 130400115 New York holt Rinehard and Winston 1965 Science Higher Additional Author Arnold, Brian Additional Author mixed material 9781843156451 London Letts Educational 2006 Science Foundation Additional Author Arnold, Brian Additional Author mixed material 1843156466 London Letts Educational 2006 Sciences Additional Author - Additional Author mixed material 8482362739 Barcelona Idea Books 2008 Additional Author Farndon, John Additional Author mixed material 19029447266 London Grolier International 2000 And Other Questions About Science Additional Author Taylor, Barbara Additional Author mixed material 0753405148 London Grolier International 2000 heitspflege auf religiofer Grundlage^cAngelina Hodel Additional Author Hodel, Angelina Additional Author mixed material - - 1934 Wonders of Science Additional Author Brian Additional Author mixed material 0862724066 London Kingfisher Books 1990 Animals and Their Economic Importance Additional Author Fitzpatrick, Frederick L. Additional Author mixed material 177640813 New York Holt,Rinehart and Winston 1963 Science Today and Tommorow Additional Author Craig, Gerald S. Additional Author mixed material Boston Ginn and Company 1955 science for the middle grades Additional Author Francis P.Cavanaugh, Reverend Additional Author mixed material New York Scott Foresman and Company - Additional Author Watkins, Ralph K. Additional Author mixed material New York The Macmillan Company 1940 Additional Author Blink, H. Additional Author mixed material Jakarta P.Noordhoof N.V. 1955 Additional Author Smith, Victor C. Additional Author mixed material New York J.B.Lippincott Company 1951