Communication policies for prisoners (visiting prisoners and prisoners writing and receiving letters) in U.S. states prisons and in some other countries’ prisons in 1902 and 1912.
- communication policies 1902: communications policies in U.S. state prisons (write letters, receive visits); not all state prisons covered. Similar data for prisons in Wurttemberg, Austria, Holland, Great Britain, and Saxony
- written communication 1912: communications policies in U.S. state prisons (sending letters, receiving letters, receiving magazines and newpapers); covers all state prisons
- written 1912 summary: summary statistics of communications policies in 1912, with comparison to specific states covered in 1902