| Unidentified photographer Manila 1840s-1850s Daguerreotype Hispanic Society of America LL/67406 Caroline Barcella, 2009, "The Conservation of the Manila Daguerreotypes", (George Eastman House, Image Permanence Institute)
(Accessed: 26 May 2016)
media.virbcdn.com/files/dd/FileItem-276483-MANILA_REPORT_for_web.pdf
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