Further observation on the response of various species of plants to length of day
Allard, H.A., Garner, W.W.
Further observation on the response of various species of plants to length of day - Washington 1940 - 1-64 p.. - Plant United States Department of Agriculture. Technical Bulletin No. 727 .
Further observation on the response of various species of plants to length of day - Washington 1940 - 1-64 p.. - Plant United States Department of Agriculture. Technical Bulletin No. 727 .