Reprint instructions and orders for 'The Observatory' magazine (Oct. 1969) vol. 89, no. 972, and correspondence with contributing authors including: Sir Martin Ryle (University of Cambridge), S. Kenderine (University of Cambridge), P. Brosche (Heidelberg), William A. Sherwood (Royal Observatory, Edinburgh), Martin Rees (University of Cambridge), A.J. Meadows (University of Leicester), A.D. Thackeray (Radcliffe Observatory, Pretoria; re. a paper by E.N. Walker and D. Jones), John Shakeshaft (University of Cambridge), Russell Cannon (Mount Stromlo & Siding Springs Observatories), and R.C. Smith (University of Sussex).