A slightly mismatched set, but complete and attractive. Herman Witsius' work on the Covenants was one of the most influential Covenantal works of the 17th century, 

Witsius, Herman. The Oeconomy of the Covenants. Between God and Man. Comprehending A Complete Body of Divinity. By Herman Witsius, D. D. Professor of Divinity in the Universities of Franeker, Utrecht, and Leyden ; and also Regent of the Divinity College of the States of Holland and West-Friesland. Faithfully Translated from the Latin, and Carefully Revised. To Which is Perfixed, the Life of the Author, Vol. I. London. Printed for Edward Dilly, in the Poultry. 1762. 426pp.

Witsius, Herman and Crookshank, William [Trans.]. The Economy of the Covenants. Between God and Man. Comprehending A Complete Body of Divinity. In Two Volumes. By Herman Witsius, D. D. Professor of Divinity in the Universities of Franeker, Utrecht, and Leyden ; and also Regent of the Divinity College of the States of Holland and West-Friesland. Faithfully Translated from the Latin, and Carefully Revised. By William Crookshank, D.D. To Which is Perfixed, the Life of the Author, Vol. II. London. Published by W. Baynes Nd. c.1820's. 464pp.

A good + set, bound in half leather, generally solid, with light to moderate foxing.