"Directions for Use: The duplicator masters published by the Fideler Company can be used with any spirit or liquid duplicating machine. They can not be used on a gelatintype duplicator. A duplicator master is provided for use with each of the 57 inquiry units in the Inquiring About Freedom textbook. [...] Each duplicator master will produce 200 copies if it is used and stored carefully. [...]"
"Directions for Use: The duplicator masters published by the Fideler Company can be used with any spirit or liquid duplicating machine. They can not be used on a gelatintype duplicator. A set of 4 duplicator masters is provided for each of the 14 major social science concepts. [...] Each duplicator master will produce 200 copies if it is used and stored carefully. [...]"