Dilworth, T. (1773). The schoolmasters assistant: Being a compendium of arithmetic, both practical and thoretical. In five parts ... To which is prefixt, An essay on the education of youth (17th ed.). Philadelphia: Printed by J. Crukshank.

Dilworth, Thomas. The Schoolmasters Assistant: Being a Compendium of Arithmetic, Both Practical and Thoretical. In Five Parts ... To Which Is Prefixt, An Essay On the Education of Youth. 17th ed. Philadelphia: Printed by J. Crukshank, 1773.

Dilworth, Thomas. The Schoolmasters Assistant: Being a Compendium of Arithmetic, Both Practical and Thoretical. In Five Parts ... To Which Is Prefixt, An Essay On the Education of Youth. 17th ed. Philadelphia: Printed by J. Crukshank, 1773.