I'm trying to determine the payroll for National Disposal Service (a
waste hauler and landfill operator) and its affiliates, parents,
and/or subsidiaries for 1969, 1970, 1971, and 1972.

As far as I can tell the following companies are all related to
National Disposal in some way. I would like to ascertain the payroll
of all these companies for the years mentioned above.

National Disposal Service, Inc. was incorporated in Delaware on May 22, 1967;  
Barrington Trucking Co., an IL corporation; 
National Disposal Service of Illinois, Inc., an IL corporation; 
Peoria National Disposal Service, Inc., an IL Corporation; 
Washington National Disposal Service, Inc., a Washington corporation; 
Pittsburgh National Disposal Service, Inc., a Pennsylvania corporation;  
Northwest Truck Service, Inc., an IL corporation; and
Inland Leasing Corporation, an IL corporation.
The above companies were merged into National Disposal Service, Inc. in 1967. 

Other affiliates of National Disposal, that were not merged, include: 
National Disposal Contractors, Inc., an IL corporation (although they
appear to have conducted business in Washington from 1963-1973);
Rockford Disposal Service, Inc., an IL corp; 
Haulaway, Inc., a Nebraska corp;
National Disposal Service of Nebraska, Inc., a Nebraska corp;
National Land Reclamation Service, Inc., a Delaware corp; and 
National Disposal Service of Michigan, Inc., a Michigan corp. 

Apparently, National Disposal Contractors, Inc. was the management
company that oversaw operations of all the above companies in addition
to maybe hauling waste and operating waste landfills. I need to know
how much the referenced companies paid out in payroll for the
referenced years.  I do not want to know anything about who was on the
company's payroll, or individual salary information.  All I want is a
total figure of what the companies paid in those years.  Can anybody
help me with this?