Leaf beginning "The pitch lake in the island of Trinidad is nearly 200 acres in extent," written on verso of a piece of stationery from Sampson Low, Marston, Low, and Searle

Leaf beginning "The pitch lake in the island of Trinidad is nearly 200 acres in extent," written on verso of a piece of stationery from Sampson Low, Marston, Low, and Searle, Box: 1, Folder: 3. Notes and annotations in 1859 edition of The Manufacture of Photogenic or Hydro-carbon Oils, MS C79. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/382356 Accessed December 24, 2025.