16mm Filmography
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KNOW YOUR SOIL seriesIES
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6
films in this series.
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Title ▲
Year
Creator
Length
Format
Color
Sound
How Plants Grow.
1964
Cenco Instruments Corp.
16mm
Color
sound
IMPORTANCE OF SOIL
pH: ACID-ALKALINE SOILS
PHOSPHORUS AND SULFUR
PHYSICAL CHARACTERISTICS
POTASH AND THE MINOR ELEMENTS