Number | Name | Date | Kind |
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890259 | Callanan | Jun 1908 | |
2504650 | Chessrown | Oct 1950 | |
3574957 | Bello-Bridick | Apr 1971 | |
3899838 | Lalley et al. | Aug 1975 | |
4173833 | Rosenblatt | Nov 1979 | |
4690409 | Scalia | Sep 1987 | |
4968255 | Lee et al. | Nov 1990 | |
5161976 | Crowe | Nov 1992 | |
5427529 | Dunse | Jun 1995 | |
5484287 | Concepcion-Diaz | Jan 1996 | |
5571019 | Wilson | Nov 1996 |
Entry |
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Classrooms That Work, Second Edition, by Patricia Cunningham and Richard Allington, Copyright 1999. pp. 65-66, ISBN 0-321-01339-5. |
Summit Learning Math catalog, p. 30, Clever Catch Balls. |