00294nam a22001217a 4500 HS 577 CHRISTOPHER F. Pond fertilization ecological approach and practical appication Philippines CHRISTOPHER F. 1998 124p; EK 9992 9992 0 0 0 577_000000000000000_CHR_1998 0 52263 LBC LBC 2016-09-16 577 CHR 1998 A01480 2016-09-16 2016-09-16 EK