Geological society of america  bulletin 
The Geological Society of America 
 - 49 v.  il. 
<br/><br/> v 67-1, v 67-2 (1956); v 68-1, v 68-2 (1957); v 69-1, v 69-2 (1958); v 70-1, v 70-2 (1959); v 71-1, v 71-2 (1960); v 72-1, v 72-2 (1961); v 73-1, v 73-2 (1962); v 74-1, v 74-2 (1963); v 75-1, v 75-2 (1964); v 76-1, v 76-2 (1965); v 77-1, v 77-2 (1966); v 78-1, v 78-2 (1967); v 79-1, v 79-2 (1968); v 80-1, v 80-2 (1969); v 81-1, v 81-2 (1970); v 82-1, v 82-2 (1971); v 83-1, v 83-2 (1972); v 84-1, v 84-2 (1973); v 85-1, v 85-2 (1974); v 86-1, v 86-2 (1975); v 87-1, v 87-2 (1976); v 88-1, v 88-2 (1977); v 89-1, v 89-2 (1978); v 90-1, v 90-2 (1979); v 91 (1980)  Colección Ing. Carlos García Gutiérrez 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geología
<br/><br/><label>Dewey Class. No.: </label>550  / GEO 1980