Manned Submersibles by Frank Busby - review, print and online book

Manned Submersibles is a fine review of small submarine technology and vehicles ala 1976. 

There is a large amount of technical information here of interest to enthusiasts and home builders.  It's not a textbook so you won't get formulas for computing crush depth, but it covers virtually every area of submersibles from ballasting systems to insurance. Down at the bottom of this page is a table of contents listing of the chapters on vehicle technology and operations.

This book was published by the US government and while a bit dated it is in the public domain and so can
be republished and freely distributed. There are a few sites hosting this book but here's the best that I've seen:

http://www.rockhounding.net/busby

The original paper, hardcover book is out of print but there are used copies available.  Here's the Sub-Log listing for Amazon.com.

Category: Design and operation of small submarines

Boats: Small submarines, submersibles, commercial built

Technical content: High

Hero:  the author, Frank Busby

Overall: Excellent

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Sample of top-level Table of Contents items:

# PRESSURE HULLS AND EXOSTRUCTURES

# BALLASTING AND TRIM SYSTEM
 

# POWER AND ITS DISTRIBUTION

# MANEUVERABILITY AND CONTROL

# SUPPORT AND HABITABILITY

# OPERATIONAL EQUIPMENTS, NAVIGATION, MANIPULATOR

# SCIENTIFIC AND WORK EQUIPMENT

# SEA AND SHORE SUPPORT
 

# CERTIFICATION, CLASSIFICATION, REQUIREMENTS

# EMERGENCY DEVICES AND PROCEDURES

# EMERGENCY INCIDENTS AND THE POTENTIAL FOR RESCUE