The almanac has a perpetual calendar from 1901 to 2100. There are only seven different calendars depending on what day of the week January 1 falls on, plus some extra pages for leap year. The list of years will show you which pages to refer to.
13 January 1971 was a Wednesday.
February 13 1971 was a Saturday.
2-13-1971 was on a Saturday.
13 June 1896 was a Saturday.
June 13, 2010 is a Sunday.
June 13 2010 was a Sunday.
June 13, 2005 was a Monday.
June 13, 1910 was a Monday.
June 13, 1912 was a Thursday.
June 13, 1975 was a Friday.
June 13, 1952, was a Friday.
June 13 1985 was a Thursday.