FIFTY YEARS OF THE UIS. 1965?2015 by Jos? Ayrton Labegalini 2015 521 pp many colour photos. A preliminary version of the history of the Union of Speleology (UIS) was developed by the author over a period of six years. He painstakingly collected historical data about the Union and its development, generally available only in scattered references or recovered from the memory of members of past UIS who had knowledge about the early years for their suggestions and contributions.  This book is the result.  HB glazed boards.