Continental Class are large breeds recognized by APA who were originally discovered in Mediterranean regions such as Belgium, France, Germany and the Netherlands.
List of Continental Class Chicken Breeds:

• Barnvelder-Breed Information
• Campine 
• Crevecoeur
• Faverolles
• Hamburg
• Houdan Breed Facts
• La Fleche
• Lakenvelder-Breed Information
• Marans-Breed Information
• Polish-Breed Information
• Welsummer

References: 
​"Chicken Breeds Recognized By The American Poultry Association". 2019. Ipfs.Io. Accessed February 8 2019. https://ipfs.io/ipfs/QmXoypizjW3WknFiJnKLwHCnL72vedxjQkDDP1mXWo6uco/wiki/Chicken_breeds_recognized_by_the_American_Poultry_Association.html.​