3 results on '"Helm, D. J."'
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2. Use of soil transfer for reforestation on abandoned mined lands in Alaska: I. Effects of soil transfer and phosphorus on growth and mycorrhizal formation by Populus balsamifera
3. Use of soil transfer for reforestation on abandoned mined lands in Alaska: II. Effects of soil transfers from different successional stages on growth and mycorrhizal formation by Populus balsamifera and Alnus crispa
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