Works of Reference Public Record Office has replaced Giuseppi's well-known Guide with a three-volume work; vol. 3 covers effectively the very recent materials.15 The detailed lists, nearly all until recently available on the spot only, are in process of being published, at the rate of twelve a year, by a new society, able to sell to members only-but very cheaply.16 The first volume of a specially commissioned series for general sale in this society's publications provides a complete list of all parliamentary materials, 1701 - 50, known to have been printed or now to survive in print.17 Deane, Cole and Mitchell have produced two useful collec- tions of statistical tables: the first treats the whole of economic history from the beginning of reliable figures (mostly about 1700), the second (which discusses as well as lists) attends to the problem of economic growth in the last 200 years.18 In Colvin's exhaustive general biography of architects, the valuable introduction provides much information especially on the growth of a profession, fact and concept.19 Powicke's handbook of chronology has appeared in a second, revised and improved, edition;20 a second edition of Cheney's handbook of dates is in preparation. A different kind of hand- book, in which the materials for historical study are analysed and discussed, covers the sixteenth century.21 15 Guide to the Contents of the Public Record Office, 3 vols. L: HMSO: 1963, 1968. Pp. vi, 249, vii, 410; vii, 190. 16 List and Index Society (address: Swift Ltd., 1-7 Albion Place, St John's Lane, St John's Street, London E.C.i). 17 Sheila Lambert, ed., List of House of Commons Sessional Papers, 7701 -7750. L: List and Index Society, special series i: 1968. Pp. xviii, 155. 18 B. R. Mitchell and Phyllis M. Deane, ed., Abstract of British His- torical Statistics. CUP: 1962. Pp. xiv, 513.-Phyllis M. Deane and W. A. Cole, British Economic Growth 1688 -1959: trends and structure. 2nd ed., CUP: 1967. Pp. xi, 350. 19 H. M. Colvin, Biographical Dictionary of British Architects, 1660-1840. L: Murray: 1954. Pp. xiv, 821. Rev: EHR 70, 329^ 20 F. M. Powicke and E. B. Fryde, ed., Handbook of British Chronology. 2nd ed. L: RHS: 1961. Pp. xxxviii, 563. 21 G. R. Elton, The Sources of History: England 1200 -1640. L: Sources of History Ltd.: 1969. Pp. 255.