I designed/published/sold The American Ballpark 15-Month Calendar.  There were 2 editions: 1983-1984 and 1984-1985.  Mine were the first ballpark calendars - many others followed!!   I still have a very limited number (about 10) of each edition.  If interested, email me at mdditaly@aol.com, and I will provide more details.  Kent Dudrear