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1. Color reaction tests for leaf cutter bees, circa 1965

Color reaction tests for leaf cutter bees, circa 1965

2. Color test for leaf cutter bees, circa 1965

Color test for leaf cutter bees, circa 1965

3. Light experiment by Dr. David O. Chilcote, 1966

Light experiment by Dr. David O. Chilcote, 1966

4. NP fertilized plot at Kasetsart University, 1959

NP fertilized plot at Kasetsart University, 1959

5. Fertilizer experiment in Thailand, 1959

Fertilizer experiment in Thailand, 1959

6. Bumblebee experiment in greenhouse, Oregon State University, Corvallis, Oregon, circa 1965

Bumblebee experiment in greenhouse, Oregon State University, Corvallis, Oregon, circa 1965