Dear Delegate, I am pleased to enclose your copy of SPACE POWER Volume 8 Number 4 which contains further papers presented at the above conference. This issue completes the 1989 volume. During 1990, as well as publishing papers on space power systems and requirements, SPACE PCWER will also include papers on lunar surface heat rejection, surface navigation on celestial bodies, application of high tenperature superconductors to space power technology, satellite attitude control, satellite interactions with the space plasma environment, and on many other cogent topics. The journal will add emphasis in biospherics and closed environments and hopes to publish material on radiation biology pertinent to long-term space activities as well. The contents for Volume 9 Number 1, 1990, is listed overleaf for your information. If you would like to receive this journal on a regular basis, why not reconmend it to your library for a subscription. Just fill in the order form below and pass it on to the relevant department to ensure that you are kept informed of the latest developments in this field. Thank you for your interest in our journal. Yours faithfully Stefan Lacny, Publicity Manager
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