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Advances in the Study of Behavior by Slater, Peter J. B., Roper,... ISBN: 9780120045280 List Price: $140.00

Advances in the Study of Behavior by Slater, Peter J. B., Roper,... ISBN: 9780120045297 List Price: $140.00

Advances in the Study of Behavior by Slater, Peter J. B., Roper,... ISBN: 9780120045327 List Price: $140.00

Start of the World by Roper, Peter S. ISBN: 9798687610735

Morning's Gray Light by Roper, Peter S. ISBN: 9780359018307 List Price: $18.00