(1969). 1970 Pennsylvania statistical abstract (20th ed.). Harrisburg: [s.n.].
Chicago Style Citation1970 Pennsylvania Statistical Abstract. 20th ed. Harrisburg: [s.n.], 1969.
MLA Citation1970 Pennsylvania Statistical Abstract. 20th ed. Harrisburg: [s.n.], 1969.
Warning: These citations may not always be 100% accurate.