Texas Arts portalWorks published/the 660s. 610s620s630s640s650s660s670s680s690s700s710s 2nd3rd4th5th6th7th8th9th10th11th12th Subcategories This category has the following 6 subcategories, out of 6 total. 661 works (1 C) 662 works (1 C) 666 works (1 C) 667 works (1 C) 669 works (1 C)B Buildings and structures completed in the 660s (6 C)