1.
Conceptual Structures : Theory and Implementation
by Pfeiffer, Heather D., Nagle...
ISBN: 9783662167496
List Price: $24.99
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Conceptual Structures Theory and Implementation 7th Annual Workshop Las Cruces, Nm, Usa, Ju...
by Nagle, Timothy E., Pfeiffer...
ISBN: 9780387574547
List Price: $73.95
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Conceptual Structures: Current Research and Practice
by Nagle, Timothy E., Nagle, J...
ISBN: 9780131758780