History of science and technology in India. V.12. Environment and ecology 

 - Delhi  Sundeep prakashan  1990 
<br/><br/><label>Subjects--Uniform Titles: </label><br/>Technology-History<br/>Technology-History<br/>Science-History<br/>Science-India
<br/><br/><label>Dewey Class. No.: </label>509.54  / K98H