Dental manpower in Florida continues to increase.
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Dentists↗
Biomedical subjects
R M Macdonald
Publications and source records attributed to R M Macdonald.
A versatile soil percolator.
A simple multiple column soil percolator is described. Individual columns operate in parallel and are independent. The apparatus may be operated by pressure or suction. An experiment on the effects of pesticides on nitrification in the percolator is described.
Bacteria↗