Formulae for the ecological reaction of crop yields
Visser, W.C.
Formulae for the ecological reaction of crop yields - Wageningen 1963 - 326-339 p. - No. 12; Netherlands Institute .
631.557
Formulae for the ecological reaction of crop yields - Wageningen 1963 - 326-339 p. - No. 12; Netherlands Institute .
631.557