RESEARCH

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http://www.daguerreobase.org/en/

Getty Research Institute, The Union List of Artist Names (ULAN)  https://www.getty.edu/research/tools/vocabularies/ulan/

Craigscamera.  https://craigcamera.com/dag/?fbclid=IwAR0CYJt5wEMsqtKERo81921OYt4BOcIUF6ayZpIy60pFDzy5s5Bf_aRPiBs

Langdonroad (Langdon, South Carolina), https://web.archive.org/web/20230626081830/https://www.langdonroad.com/

Pioneer American Photographers (Chris Steele), https://pioneeramericanphotographers.com/about/?fbclid=IwAR2TOmbOroh3-kFY-fBs8bvVwrE1BqtO1NwQQtq0EJ9Kxrq-npziT0aeOzU

New York Public Library, https://pic.nypl.org/?fbclid=IwAR1lUIXnrD939zgjgoxOR4y0Xpel7ElvNKn1bMqOe2tp49uAZv07EbEVrwE

PhotographyDatabase, https://photographydatabase.org/about.html?fbclid=IwAR19gjdu6UsYvCHsuOp8W7IQBxh7hww9x6y_3c1hlc8OI2PpizL9SHv-wDw

Luminous Lint (Alan Griffiths), https://luminous-lint.com/app/home/P1

Arts Council England, https://collectionstrust.org.uk/resources-start/

https://lucerna.exeter.ac.uk/options.php

Schimmelman, Janice Gayle. American Photographic Patents 1840-1880 : The Daguerreotype & Wet Plate Era. 1st ed., Carl Mautz Pub, 2002.

https://books.google.com/books?id=Mx4g6fxeBUwC&newbks=1&newbks_redir=0&printsec=frontcover&pg=PA56&dq=Slocum+and+Watkinson+patent&hl=en&source=gb_mobile_entity#v=onepage&q=Slocum%20and%20Watkinson%20patent&f=false