Within 60 days after the effective date of the regulations in this part (January 1, 1949), concessioners shall file with the Director of the National Park Service a copy of each labor agreement in effect on the effective date of the regulations in this part, covering rates of pay, hours of work, and conditions of employment duly negotiated with their employees as a whole or by class, craft, or other appropriate unit. Thereafter, on July 1 of each year concessioners shall file copies of all such agreements then in effect with the Director of the National Park Service.