docs: function(params, cb) {
      var listData =  [];
      S3Handler.s3.listObjects(params, function(err, data) {
          if (err) {
            if (CONSOLE_MESSAGES) console.log(new Date().toISOString(),"S3.listObjects Error:", err);
            cb(err, null);
          } else {
            var contents = data.Contents;
            listData = listData.concat(contents);
            if (data.IsTruncated) {
              // Set Marker to last returned key
              params.Marker = contents[contents.length-1].Key;
              s3ListObjects(params, cb);
            } else {
              cb(null, listData);
            }
          }
      }); // s3.listObjects
    }