Principles of heating, ventilating, and air conditioning : a textbook with design data based on the 1997 ASHRAE Handbook--Fundamentals /

por Howell, Robert W. 1916-, Howell, Robert W. 1916-, Sauer, Harry J., Coad, William J.
Publicado 1998

Exploitation of physiological and genetic variability to enhance crop productivity /

por Harper, James E., Harper, James E.
Publicado 1985

[Proceedings] /

Publicado 1971