Since 1938, many states have adopted rules similar to the FRCP. However, some states, like California, have civil procedure systems, which deviate significantly from the federal rules; the California Codes provide for four separate types of class actions. As a result, there are two separate treatises devoted solely to the complex topic of California class actions. Some states, such as Virginia, do not provide for any class actions, while others, such as New York, limit the types of claims that may be brought as class actions.