"Executed by Richard Earlom, in the manner and taste of the drawings. To which is added a descriptive catalogue of each print; together with the names of those for whom, and the places for which, the original pictures were first painted, (taken from the hand-writing of Claude le Lorrain on the back of each drawing) and of the present possessors of many of the original pictures."
"[Richard Earlom] ... engraved a series of prints after the original drawings of Claude Lorraine, in the possession of the Duke of Devonshire. These drawings were called the Liber veritatis, and were made for the purpose of identifying the real works of Claude from others said to be from his hand. These engravings are executed in imitation of the original drawings ... They were at first produced only in outline ... The demand was so extensive that Boydell caused Earlom to retouch and refresh the plates no less than five or six times ..." Dictionary of National Biography, Volume 16, p. 324 (New York: Macmillan and Co., 1888)
Statement of responsibility: Title of v. 3 reads: Liber veritatis; or, A collection of prints, after the original designs of Claude le Lorrain; in the collection of His Grace the Duke of Devonshire, Earl Spencer, Richard Payne Knight, Benjamin West, P.R.A., Charles Lambert, Edward Turnor, George Gosling, and Joseph Farrington, esqrs. Executed by Richard Earlom ... London: Hurst, Robinson and co., 1819.
Date: Dedication dated 1777.
Content: v. 1 and 3 have frontispiece portraits: v. 1, Claude le Lorrain; v. 3, John Boydell.
Citation/reference: "The life of Claude de Lorrain," v.1, p. [5-10]