code: function doNextFolder (ix) {
  					if (ix < list.length) {
  						var listname = list [ix];
  						getRiverData (listname, function () {
  							doNextFolder (ix + 1);
  							});
  						}
  					else {
  						callback ();
  						}
  					}
docs: 6/4/15 by DW