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1.
Economics of a Technology-Based Service Sector by Leech, David P., Link, Albe... ISBN: 9780788173158 List Price: $35.00
2.
The Economic Impacts of the Advanced Encryption Standard, 1996-2017 (Annals of Science and T... by David P. Leech, Stacey Ferr... ISBN: 9781680835885 List Price: $90.00