Bridge Bidding

"Bridge Bidding" is a free book written for Contract Bridge players whose ability ranges from advanced beginners to advanced.  The book has an open-source license.

The book as a web site is at:  https://pfdubois.github.io/BridgeBidding/index.html

The copyright page has links to also get the book as a PDF, as a file for your e-book reader or tablet, as a download for offline use, and as a collection of individual text files for each chapter for easily sharing a topic with a partner.