20928 1102 10 Grolier Primary Author mixed material Canada Grolier Incorporate 1969 Grolier Primary Author mixed material Canada Grolier Incorporate 1969 Grolier Primary Author mixed material Canada Grolier Incorporate 1969 Grolier Primary Author mixed material Canada Grolier Incorporate 1969 Grolier Primary Author mixed material Canada Grolier Incorporate 1969 Grolier Primary Author mixed material 717212009 New York Grolier Incorporate 1969 vol2.jpg.jpg Grolier Primary Author mixed material 717212009 New York Grolier Incorporate 1969 vol1.jpg.jpg Helen Hynson Merrick Primary Author mixed material 011720801X New York Grolier Incorporate 1970 Darrell D. Ebbing Primary Author Mark S. Wrighton Additional Author mixed material 0395314895 Dallas Houghton Mifflin Company 1984 Harrison Shull Additional Author Robert T. Conley Additional Author Daryle H. Busch Primary Author mixed material 0205057047 Boston Allyn and Bacon 1978