00401nam a22001217i 4500001001000000005001700010008004100027082001800068245009300086260004600179300001700225650003700242SXC01350920260819093541.0260101s1967    ii            000 0 eng d  a550 TEA.122210aTeacher's guide investigating the earth, Part1: Earth science curriculum project /cs.n.  abHoughton Mifflin Company, Boston,c1967  ap. ;c22 cm. 0aSciences of earth & other worlds