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OCR-text (abbyy)
Gillam, W	Sherman
The geographical distribution of soil black
pigment.
8:o Lincoln 1938.
Diss. /Abstract./
Ur: Journal of the American society of agro-
nomy. Vol. 31. No.5.
OCR-text (abbyy-crop)
Gillam, W	Sherman
The geographical distribution of soil black
pigment.
8:o Lincoln 1958.
Diss. /Abstract./
Ur: Journal of the American society of agro-
nomy. Vol. 31. No.5.
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