This is a summary of SEAN Bulletin, 6(10), October 31, 1981, a publication of the Smithsonian Institution. The complete bulletin is available in the microfiche edition of Eos, as a microfiche supplement, or as a paper reprint. For the microfiche, order document number E81-010 at $1.00 from AGU, 2000 Florida Avenue, N.W., Washington, D.C. 20009. For reprints, order SEAN Bulletin (give dates and volume number) through AGU Separates: $3.50 for the first copy for those who do not have a deposit account; $2 for those who do; additional copies are $1.00. Order must be prepaid.