I have found this book very helpful in adding more openings and defenses to my game.
Included are The Max Lange Gambit, The Max Lange Attack, Giuoco Piano, The Evans Gambit, Spanish Bird's Defense, Spanish Moller Defense, Spanish Exchange Variation, Spanish Four Knights, Three Knights Game, Scotch Game, Scotch Goring Gambit, Bishop's Opening, Vienna Game, Vienna Game Poisoned Pawn, The King's Bishop Gambit and The Center Game.
Quite a bit of material and ideas are presented and I have found the Max Lange sections and the Moller defense to the Spanish particularly helpful.
Two thumbs up.