Keeping Track
The Penton Owners Monthly Newsletters
December 1972 - October 1976
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- No. 1 December 1972
- No. 2 January 1973
- No. 3 February 1973
- No. 4 March 1973
- No. 5 April 1973
- No. 6 May 1973
- No. 7 June 1973
- No. 8 July 1973
- No. 9 August 1973
- No. 10-11 Sep-Oct 1973
- No. 12 November 1973
- No. 13 February 1974
- No. 14 April 1974
- No. 15 June-July 1974
- No. 16 August 1974
- No. 17 Sep-Oct 1974
- No. 18 December 1974
- No. 19 Jan-Feb 1975
- No. 20 June 1975
- No. 21 August 1975
- No. 22 November 1975
- No. 23 February 1976
- No. 24 May 1976
- No. 25 September 1976
- No. 26 October 1976