A short list of good books ...
Engineering
Analysis and Design of Flight Vehicle Structures Elmer F. Bruhn
Aircraft Structures, First Edition David J. Peery
Stresses in Aircraft and Shell Structures Paul Kuhn
Advanced Mechanics of Materials Fred Seely and James Smith
Airplane Structures A.S. Niles and J.S. Newell
Theory of Plates Stephen Timoshenko
Theory of Elastic Stability Stephen Timoshenko
A Supplement to Analysis and Design of Flight Vehicle Structures William F. McCombs
Engineering Column Analysis – The Analysis of Compression Members William F. McCombs
Weight-Strength Analysis of Aircraft Structures Francis R. Shanley
Strength of Materials Francis R. Shanley
Mechanics of Materials Francis R. Shanley
Mechanics of Materials Gere and Timoshenko
Advanced Mechanics of Materials Stephen Timoshenko
Advanced Mechanics of Materials A.P. Boresi, R.J. Schmidt
Fundamentals of Aircraft Design Leland Nicolai
Helicopter Performance, Stability, and Control Raymond W. Prouty
Aerodynamics of the Helicopter Alfred Gessow, Garry Myers Jr.
MSC/NASTRAN Primer, Static and Normal Modes Analysis H.G. Schaeffer
Introduction to Flight John D. Anderson, Jr.
Fundamentals of Aerodynamics John D. Anderson, Jr.
Computational Fluid Dynamics John D. Anderson, Jr.
Excel 2003 Power Programming with VBA John Walkenbach
Excel 2003 Formulas John Walkenbach
UNIX in a Nutshell Arnold Robbins
The VNR Concise Encyclopedia of Mathematics Gellert/Kustner/Hellwich/Kastner
Composite Materials
Mechanics of Composite Materials Robert M. Jones
Mechanics of Composite Structures László P. Kollár
Design and Manufacture of Composite Structures Geoff Eckold
Primer on Composite Materials Analysis John C. Halpin
Principles of Composite Material Mechanics Ronald F. Gibson
Mechanics of Composite Materials Autar K. Kaw
Composite Airframe Structures Michael C. Y. Niu
Honeycomb Sandwich Design Technology Hexcel Composites
See TSB124 and TSB120.
Honeycomb Sandwich Design Technology references:
Honeycomb Technology: Materials, Design, Manufacturing, Applications and Testing by Tom Bitzer
An Introduction to Sandwich Construction by D. Zenkert
Piping Stress Analysis
Introduction to Pipe Stress Analysis Sockalingam (Sam) Kannappan
Piping Stress Handbook Victor Helguero
Piping and Pipe Support Systems P.R. Smith and T.J. Van Laan
Practical Guide to ASME B31.3: Process Piping Glynn Woods & Roy Baguley
Flow of Fluids Through Valves, Fittings and Pipe Crane Technical Paper 410
Design of Piping Systems M. W. Kellogg Company
Piping Design and Engineering Bluebook Anvil International
(formerly Piping Design and Engineering by Grinnell, Inc)
Best of luck.