 However, Roger C. Owen has argued that Meigs' population estimates were substantially too high.Information about the cultural practices of the pre-contact Kiliwa comes from a variety of sources.These include accounts of early explorers, such as Juan Rodríguez Cabrillo and Sebastián Vizcaíno; from late eighteenth and early nineteenth century observers, such as Luis Sales and José Longinos Martínez; and from twentieth century ethnographers, including Peveril Meigs, William D. Hohenthal, and Jesús Ángel Ochoa Zazueta.