TY  - BOOK
AU  - Purohit,S.S.
AU  - Agrrawal, A. K.
AU  - Shammi, Q. J.
TI  - A text book of environmental sciences: as per unified ugc syllabus 
SN  - 8188826146 (pbk)
PY  - 2004///
CY  - Jodhpur (India)
PB  - Student edition
KW  - Environmental sciences
N1  - Includes bibliographical references
ER  -