The bubble of the age; or, The fallacy of railway investment (1848) [pdf]dn721608.ca.archive.org 1rfv67231modiscuss
The Four-Color Problem and Its Philosophical Significance (1979) [pdf]thatmarcusfamily.org 4rfv67232modiscuss
Railroads are unnecessary: no ship in Liverpool waits for Manchester goods (1826)hansard.parliament.uk 3rfv67233modiscuss
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