Surveys of ragweed pollination in the New York metropolitan district in 1948 and 1949.
WISEMAN
R D
RD
SIEGEL
B B
BB
GLAZER
I
I
CHAIT
R A
RA
WALZER
M
M
D031164:Ambrosia; D003625:Data Collection; D006801:Humans; D009518:New York; D054817:Pollination