Perpetual Calendar: Eight Routines Using Playing Cards and a Pocket Diary or Calendar
by Aldo Colombini

• Centrifugal Diary: Peter Duffie
• Have a Date: Aldo Colombini
• The Flexible Diary: Peter Duffie and Robin Robertson
• The Diary of Expectation: Peter Duffie
• Freedom Diary: Peter Duffie and Aldo Colombini
• Versatile Diary: Peter Duffie, Aldo Colombini and Robin Robertson
• Happy Birthday: Aldo Colombini
• Zodiac Month: Aldo Colombini

1st edition 2009; 22 pages.
word count: 3219 which is equivalent to 12 standard pages of text