Francisco,
What you probably need is CFR 50, "Regulations Governing Processed Fishery Products". This document will give you all of the information you need with regard to shrimp grading. You can download that information from: http://seafood.nmfs.noaa.gov/standards.htm
If you specifically want the Handbook 25, you can contact National Seafood Inspection Laboratory, Documentation Approval, P.O. Drawer 1207, Pascagoula, MS 39568. Phone 228-762-1892.
Myron Crider
USDC, CSO (Retired)
Seafood Quality Management Services
Atlanta, GA
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