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William Nicholson (of Halifax )
Key to Nicholson's Simplified and Improved Edition of Walkingame's Arithmetic [his Tutor's Assistant]
![Key to Nicholson's Simplified and Improved Edition of Walkingame's Arithmetic [his Tutor's Assistant]](https://s3.amazonaws.com/readfeedstatic/book_covers/thumbnails/rf-placeholder.png)