A key to F. Walkingame's tutor's assistant: containing the solutions of the questions in that work; with the references as they stand in the last edition of that book printed for Wilson, Spence, and Mawman, York. To which is added, some useful rules, &c. By T. Crosby.
Crosby, T.(Thomas),Headmaster of the York Charity Schools.
York : printed by and for Wilson, Spence, and Mawman,
1797.
ESTC
Also reproduced on microfilm. Woodbridge, CT: Research Publications, Inc., 1986. The Eighteenth Century ; reel 1428, no. 12.