Further details can be inferred from the appropriate listings of PACS numbers ( see the January 1983 issues of the respective series). ... Four issues usually constitute one volume; and three volumes are planned per year. ... Please note that this journal IS also available in microform; subscribers to the regular edition are entitled to a 50% discount. ... All communications should include both old and new addresses (with postal codes) and should be accompanied by an address label fromanbsp;...