'From 1793 to 1837, this was pure copper; in 1982 its composition was changed to 97.5% zinc & 2.5% copper'
a penny
COP ROCK: From 1793 to 1837, this was pure copper; in 1982 its composition was changed to 97.5% zinc & 2.5% copper
From 1793 to 1837, this was pure copper; in 1982 its composition was changed to 97.5% zinc & 2.5% copper
From 1793 to 1837, this was pure copper; in 1982 its composition was changed to 97.5% zinc & 2.5% copper
COP ROCK
a penny
COP ROCK