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This publication combines and replaces Forestry Commission Field Book 1: Top Diameter Sawlog Tables and Forestry Commission Field Book 11: Mid Diameter Volume Tables. The top diameter method for assessing volume is restricted to groups of sawlogs, preferably of uniform length up to 8.4 m. Volume determination using the mid diameter method is traditionally used for assessing timber lengths such as sawlogs, selected poles and billets. Further information on the choice of volume assessment method can be found in Forest Mensuration: A Handbook for Practitioners where these tables are reproduced.