National Environmental Policy Act of 1969, environmental indices, status of development pursuant to sec. 102(2) and 204 of act / 
prepared by [James W. Curlin] Environmental Policy Division, Congressional Research Service, Library of Congress ; Dec. 1973. 
 - [Washington, D.C.],  1973. 
 - vii, [1], 46 p. 
<br/><br/> Committee print, 93d Congress, 1st session.  Document for sale by the Superintendent of Documents, paper, 55c.  CRDP Program Historic Shelflist record. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Human ecology--Mathematical models.<br/>Pollution--Measurement.
<br/><br/><label>Gov. Doc. Class. No.: </label>Y 4.IN 8/13:EN 8/9