Queen's Gambit Declined - Orthodox Variation

Queen's Gambit Declined - Orthodox Variation contains a number of interesting suggestions that have never been implemented. This chess book has been updated with a supplement containing the latest games and grandmaster analysis in 2012.

For a 1200+ FIDE rated player, what are some good books on

Neil McDonald - Starting Out - Queen's Gambit Declined

Elephant Trap in Queens Gambit Declined Variation

How to play the Queen's gambit declined - Quora

The Queen's Gambit Declined: A Perfect Opening for Chess Beginners

Chess openings: Queen's Gambit Declined Semi-Slav (D43)

Fundamentals of Isolated Queen Pawn Positions – IM Bill Paschall

Queen's Gambit Complete Guide

NIC Yearbook 127 - HARDCOVER EDITION

Queens Gambit Declined - The Art of Chess - Chess Master