Volcanic Ash Layers Found in Pacific

Chicago citation style
Volcanic Ash Layers Found in Pacific. 1960-05-05. Retrieved from the Digital Public Library of America, https://library.ucsd.edu/dc/object/bb88067942. (Accessed December 11, 2018.)
APA citation style
(1960-05-05) Volcanic Ash Layers Found in Pacific. Retrieved from the Digital Public Library of America, https://library.ucsd.edu/dc/object/bb88067942
MLA citation style
Retrieved from the Digital Public Library of America <https://library.ucsd.edu/dc/object/bb88067942>.
Note: These citations are programmatically generated and may be incomplete.