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Ada Language 
Ada 95: The Craft of Object-Oriented Programming (John English) [Mirror]
Ada in Action: Practical Programming Examples (Do-While Jones)
Ada-95 for C and C++ Programmers (Simon Johnston) Ada 95 Rationale (Laurent Guerby)
Ada for Software Engineers (by M. Ben-Ari, in zipped PDF) Learn Ada on the Web (Fintan Culwin)
Ada Distilled: An Introduction to Ada Programming (Richard Riehle) [Mirror]
Quick Ada (Dale Stanbrough) Ada 95 Reference Manual (Magnus Kempe) [Mirror]
The Big Online Book Of Linux Ada Programming (Ken O. Burtch)
Ada and Beyond: Software Policies for the Department of Defense