00282nam a2200097Ia 4500008004100000082002000041100002400061245005100085260004100136300000700177140113s9999    xx            000 0 und d  a629.13.631   L0  a"Baumgardner, M.F."  aAerospace science and agricultural development  a1970bAmerican Soc. AgronomycU.S.A.  a48