Official Joint Planning in the United States (PAS Report 56)

Joint planning — coordinated planning activities among adjacent governmental units — is an important means of addressing situations where physical planning problems extend over political boundaries. The first joint planning agency appeared in Kentucky in the mid-1920s, but this form of planning administration quickly multiplied in the years after World War II. 

This historic PAS report from 1953 offers a comprehensive survey of joint planning organizations from across the United States.