Incoming Resources
- Arco, New York, 1969
- Arco, Distributed by Thomson Learning, New York, c2001-
- Arco, New York, 1973, c1971
- Arco, New York, c1960
- Arco, New York, 1972
- Arco, New York, 1973, c1972
- Arco, New York, 1975, c1967
- Arco, New York, 1967
- InterLingua Educational Publishing, Thomson Peterson's, Arco, United States?, 2006?
- Arco, New York, ©1988
- Arco, New York, c1973