Simmonds, P G The unextractable organic fraction of the pueblito de allende meteorite: evidence for its indigenous nature. [electronic resource] - Proceedings of the National Academy of Sciences of the United States of America Nov 1969 - 1027-34 p. digital Publication Type: Journal Article ISSN: 0027-8424 Standard No.: 10.1073/pnas.64.3.1027 doi