The anchor puzzle book : the amazing stories of more than 50 new puzzles made of stone /
Slocum, Jerry.
Gebhardt, Dieter.
Botermans, Jack.
Raizer, Harold.
Sonneveld, Dic.
Beverly Hills, Calif. : Slocum Puzzle Foundation,
2012.
Includes bibliographical references and index.
Richter, Friedrich Adolf, 1846-1910.
Tangrams.
Tangrams