by Daniel Trembly MacDougal
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The influence of carbon dioxide on the p...
Light and the rate of growth of plants
Tree trunks, growth and reversible varia...
Swelling of agar in solutions of aminus ...
Camp-fires on desert and lava
Substances regulating the passage of mat...
Life Cycles
Lee Friedlander
The desert year
Explorers Wanted! (Explorers Wanted)
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Desert giant