Details of Publications 4. The three major publications referred to in Para. 2 are analysed in Appendices C and D and are dealt with in detail in Para. 5 below. A brief description is given in appendix B of the remaining publications with sufficient detail of each to show that as far as they are concerned there is no duplication. Major Publications 5. The main problem lies in the publications of I.S.T.D., P.W.E. and N.I.D. which are bulkier in volume and have a wider circulation than those dealt with in Appendix B.