Collier's New Encyclopedia — Penny (1921)
“ Then they go to an automatic weighing machine, which throws out all the imperfect coins. In 1897 Pennsylvania took the most pennies, 11,000,000. New York came next with a demand for 9,000,000, and in New Mexico, where the penny is little used, only 4,000 were asked for. It is estimated that 100,000 pennies a year are lost in various ways. ”
