Soon after his building was finished, builders in Chicago and New York City began copying and improving on the idea of building up.

VOA: special.2010.03.31

Cassatt worked hard copying the great paintings hanging in the Louvre museum.

VOA: special.2009.07.12

In the U.S.,electric utilities lead the opposition to copying this rate structure, and to mandating purchases of alternative power.

VOA: standard.2010.03.23