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12Subjects: “...Micro-diffusion technique of Paasche & Brubak 1994 modified by Balch etal 2000...”
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14Subjects: “...Micro-diffusion technique of Paasche & Brubak 1994 modified by Balch etal 2000...”
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18by American Geographical Society of New York; Balch, Edwin Swift, 1856-1927; Bowman, Isaiah, 1878-1950“...Balch...”
Published 1919
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