01032agm a2200313u 4500 996367470102311 20260227104059.0 mr-caaad 800828s1979 xxu023 e 0mlengmc 80700159 /F (TU)000636747UTK01 669517 (OCoLC)06890495 National Geographic Society DLC m.c. TKN TKNk QE511.5 QE511.5 .O8 QE511.5.O8 Our dynamic Earth. [motion picture] / National Geographic Society. Washington : The Society, c1979. 1 reel, 23 min. : sd.,col. ; 16 mm. & teacher's guide. Title from data sheet. Also issued as videorecording. Examines information about continental drift gathered from deep sea research. Continental drift. National Geographic Society (U.S.) primo 193 193