La economía de la agricultura /

por Metcalf, David, Metcalf, David
Publicado 1974

The economics of agriculture

por Metcalf, David
Publicado 1969

Resource structure of agriculture : an economic analysis /

por Cowling, Keith., Metcalf, David H., Rayner, A. J.
Publicado 1970

Resource structure of agriculture, an economic analysis /

por Cowling, Keith, Cowling, Keith, Metcalf, David, Rayner, A. J.
Publicado 1970

Research - based guidelines for designing blended learning.

por Sims, Dana E.