Workman, B. (1790). Poor Robin's almanac, for the year 1791: Being the third after bissextile or leap-year. Philadelphia: Printed and sold by John M'Culloch, in Third-street, No. 1, above Market-street.

Workman, Benjamin. Poor Robin's Almanac, for the Year 1791: Being the Third After Bissextile or Leap-year. Philadelphia: Printed and sold by John M'Culloch, in Third-street, No. 1, above Market-street, 1790.

Workman, Benjamin. Poor Robin's Almanac, for the Year 1791: Being the Third After Bissextile or Leap-year. Philadelphia: Printed and sold by John M'Culloch, in Third-street, No. 1, above Market-street, 1790.