Robert K. Heldman
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Global Telecommunications: Layered Networks' Layered Services
Heldman, Robert K.
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Future Telecommunications: Information Applications, Services, & Infrastructure
Heldman, Robert K.
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Information Telecommunications: Networks, Products, & Services
Heldman, Robert K.
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Isdn in the Information Marketplace
Heldman, Robert K.
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The Telecommunications Information Millennium: A Vision and Plan for the Global Information Society
Heldman, Robert K.; Bystrzycki, Thomas A.
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