Midnight calculator
Subtitle: an expedient for the observance of church laws involving the reckoning of time
By: by James O. Patterson and George E. O'Donnell.
Contributors: O'Donnell, George Edward, 1896- joint author.
Published: 1950
Place of publication: Philadelphia
Language: eng
Number of pages: 84
Subjects: Time -- Conversion tables.; Church calendar.
Notes: Diagram with movable part in pocket.