| Effect of the relative length of day and night and other factors of the environment on growth and reproduction in plants WW Garner, HA Allard Monthly Weather Review 48 (7), 415-415, 1920 | 1766 | 1920 |
| Further studies in photoperiodism, the response of the plant to relative length of day and night WW Garner J. agric. Res. 23, 871-920, 1923 | 700 | 1923 |
| Photoperiodic response of soybeans in relation to temperature and other environmental factors WW Garner, HA Allard United States Department of Agriculture, 1930 | 166 | 1930 |
| Bulb formation in some American and European varieties of onions as affected by length of day. R Magruder, HA Allard | 146 | 1937 |
| Further observations of the response of various species of plants to length of day HA Allard, WW Garner | 140 | 1940 |
| The mosaic disease of tobacco HA Allard Science 36 (938), 875-876, 1912 | 139 | 1912 |
| Effect of abnormally long and short alternations of light and darkness on growth and development of plants WW Garner J. agric. Res. 42, 629-651, 1931 | 113 | 1931 |
| Oil content of seeds as affected by the nutrition of the plant WW Garner, HA Allard, CL Foubert Department of Agriculture, 1914 | 90 | 1914 |
| GROWTH AND FLOWERING OF SOME TAME AND WILD GRASSES IN RESPONSE TO DIFFERENT PHOTOPERIODS¹ HA Allard, MW Evans Journal of Agricultural Research 62, 193, 1941 | 87 | 1941 |
| Gigantism in Nicotiana tabacum and its alternative inheritance HA Allard The American Naturalist 53 (626), 218-233, 1919 | 74 | 1919 |
| The first morning song of some birds of Washington, DC; its relation to light HA Allard The American Naturalist 64 (694), 436-469, 1930 | 72 | 1930 |
| Localization of the response in plants to relative length of day and night WW Garner, HA Allard United States Department of Agriculture, 1925 | 72 | 1925 |
| Some properties of the virus of the mosaic disease of tobacco HA Allard | 71 | 1916 |
| The natural history of the box turtle HA Allard The Scientific Monthly 41 (4), 325-338, 1935 | 68 | 1935 |
| The Canaan and the Stony River valleys of West Virginia, their former magnificent spruce forests, their vegetation and floristics today HA Allard, EC Leonard Castanea 17 (1), 1-60, 1952 | 67 | 1952 |
| Responses of beans (Phaseolus) and other legumes to length of day HA Allard, WJ Zaumeyer | 66 | 1944 |
| Complete or partial inhibition of flowering in certain plants when days are too short or too long. HA Allard | 62 | 1938 |
| Relation of length of day to growth of timothy. MW Evans, HA Allard | 60 | 1934 |
| The North American ragweeds and their occurrence in other parts of the world HA Allard Science 98 (2544), 292-294, 1943 | 52 | 1943 |
| Photoperiodism, the response of the plant to relative length of day and night WW Garner, HA Allard Science 55 (1431), 582-583, 1922 | 52 | 1922 |
