Michael Turner, John Beckett, and Bethanie Afton have assembled a data set based on a large number of English farm records (in the form of account books, wage/labor books, and memoranda books). Some of the fruits of this effort appeared previously in Turner, Beckett, and Afton's Agricultural Rent in England, 1690–1914 (Cambridge: Cambridge University Press, 1997). This new book employs a subset of 979 of these farm records to cast new light on some important aspects of English farm production in the period 1700 to 1914. In addition to the introduction and conclusion, the book comprises five substantive chapters. Chapter 2 discusses the records as a source; chapter 3 considers some aspects of farming practice (notably cropping patterns and fertilizer use); chapter 4 presents new estimates of wheat yields; chapter 5 presents new estimates of barley and oat yields; and chapter 6 presents new evidence on livestock weights. The most important findings of the book are that the overall growth in wheat, barley, and oat yields was much lower than is commonly thought, and that the main period of yield growth occurred between the 1820s and 1850s. The authors argue on this basis that the Agricultural Revolution can be fixed firmly in the period 1800 to 1850. The great strength of the book is that the data on which it is based are almost entirely new. For that reason, it is a very welcome contribution to our stock of knowledge, and both the authors and their funding body (the Leverhulme Foundation) are to be congratulated.