Appendices 1 and 2 contain time series for Soviet production of military and basic industrial goods listed under a number of headings. Each appendix falls into two main parts – a table of annual data covering the years from around 1928 or 1930 to 1945, and a table of quarterly data covering the wartime period only. In each appendix, these tables are designed to be read together – each table supplements the other, and does not merely repeat the information in the other table in more or less detail. This feature arises from the very large number of gaps in the Soviet statistical record. Inadequacies of published information mean that annual statistics must sometimes be pieced together from more detailed series, and quarterly figures must often be deduced or approximated from data for surrounding periods. Where no estimate is possible, the appropriate cell in the table is left blank. The reader who seeks a figure in the annual series and finds it missing may nonetheless be helped by finding incomplete quarterly data provided for the year concerned. Similarly, where the quarterly series is incomplete, an annual figure may nonetheless be provided.