THE ESTIMATED NUMBER OF STAMP COLLECTORS IN THE UNITED STATES IS _...
17. The estimated number of stamp collectors in the United States is _________.
A. 22 million
B. 12 million
C. 20 million
D. 21 million
17. The estimated number of stamp collectors in the United States is _________.
A. 22 million
B. 12 million
C. 20 million
D. 21 million