No access restrictions Many of SIA's holdings are located off-site, and advance notice is recommended to consult a collection. Please email the SIA Reference Team at osiaref@si.edu
Fries, Carl, Hibbard, Claude William and Dunkle, David Hosbrook. 1955. Early Cenozoic vertebrates in the red conglomerate at Guanajuato, Mexico. Smithsonian Miscellaneous Collections, 123(7): 1-25.