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Brooks, Samuel Wallace.Improvements in Machines for Making Paving-Blocks.,
patent,
October 24, 1871;
[Washington D.C.].
(https://texashistory.unt.edu/ark:/67531/metapth165303/:
accessed April 23, 2024),
University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu;
crediting UNT Libraries Government Documents Department.