000
00294nam a2200109Ia 4500
008
191031s9999 xx 000 0 und d
100
_a
HEADY (Earl O) and DILLON (John L)
245
0
_a
Agricultural production function
260
_b
"IOWA state uni press, USA"
260
_c
1961
942
_c
BK
999
_c
214755
_d
214755