00965nam a2200325 a 4500 2300047 BD-DhUL 20150108181341.0 820419s1981 enka b 001 0 eng 80042231 GB*** 0126565600 DLC DLC DLC BD-DhUL S494.5.P75 S63 631.5 19 SPB Spedding, C. R. W. Biological efficiency in agriculture / C.R.W. Spedding, J.M. Walsingham, and A.M. Hoxey. New York : Academic Press, c1981. x, 383 p. : ill. ; 23 cm. TK 2800.00 Includes bibliographies and index. Agricultural productivity. Biological productivity. Agriculture. Biology, Economic. Walsingham, J. M. Hoxey, A. M. 7 cbc orignew 2 ocip 19 y-gencatlg ddc BK 29154 29154 0 0 ddc 0 631_500000000000000_SPB 0 NFIC 54576 DUSL DUSL GEN 1985-06-11 Purchased 631.5 SPB A276129 2015-01-08 2 2015-01-08 BK 0 0 ddc 0 631_500000000000000_SPB 0 NFIC 54578 DUSL DUSL GEN 1985-06-11 Purchased 631.5 SPB A276128 2015-01-08 1 2015-01-08 BK