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References
1.
Regulation, April 19th, 1969 (Dziennik Ustaw No. 13, position 98).
2.
Prime Minister's Instruction No. 96, Sept. 30th, 1969.
3.
Dziennik Ustaw No. 21, position 126.
4.
Regulation, July 21st, 1969 (Dziennik Ustaw No. 21, position 151).
5.
Prime Minister's Instruction No. 57, July 17th, 1969.