Lal, J. B.
Environmental conservation / J. B. Lal. - Dehradun : International Book, 1987. - 111 p. : ill. ; 22 cm.
341 341
Natural resources and energy.
333.7 / J1e
Environmental conservation / J. B. Lal. - Dehradun : International Book, 1987. - 111 p. : ill. ; 22 cm.
341 341
Natural resources and energy.
333.7 / J1e