00470nam a2200157Ia 4500001001000000003000500010008004100015010001100056040000900067100002000076245008900096260004600185300001000231440004400241650002700285Para_4401CHAP220125s1942 xx 000 0 und d a202914 cCHAP aVansell, Geo. H aFactors affecting the usefuiness of honeybees in pollination /c by Geo. H. Vansell aWashington :b Department of Agriculture a32 p. aEUA. Dept. of Agriculture Circular; 650 aAbejas PolinizacioĢn