The directional growth of organisms in response to light. In plants, aerial shoots usually grow towards light. The phototropic response is thought to be controlled by auxin (= AUXINS), a plant growth substance. (From Concise Dictionary of Biology, 1990)
Helium -- Government policy. : Selling the nation's helium reserve / Committee on Understanding the Impact of Selling the Helium Reserve, Board on Physics and Astronomy, National Materials Advisory Board, Division on Engineering and Physical Sciences, National Research Council of the National Academies
2010
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Helium -- Government policy -- United States : Selling the nation's helium reserve / Committee on Understanding the Impact of Selling the Helium Reserve, Board on Physics and Astronomy, National Materials Advisory Board, Division on Engineering and Physical Sciences, National Research Council of the National Academies
Helium-Methode : Quantitative thermochronology : numerical methods for the interpretation of thermochronological data / Jean Braun, Peter van der Beek, Geoffrey Batt
Helium -- United States -- Marketing : Selling the nation's helium reserve / Committee on Understanding the Impact of Selling the Helium Reserve, Board on Physics and Astronomy, National Materials Advisory Board, Division on Engineering and Physical Sciences, National Research Council of the National Academies
Hughes, Hatcher, 1881-1945. Hell-bent fer heaven : Drama for students. Volume 31 : presenting analysis, context, and criticism on commonly studied dramas / Sara Constantakis, project editor ; foreword by Carole L. Hamilton
Hell -- Comparative studies : Hell and its rivals : death and retribution among Christians, Jews, and Muslims in the early Middle Ages / Alan E. Bernstein
Hell Fire Club (Medmenham, England) / http://id.loc.gov/authorities/names/nr00029201 : The hell-fire clubs : sex, Satanism and secret societies / Evelyn Lord
