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 | | The pine forests, which cover large tracts of sandy soil in the Lake States, are composed of varying mixtures of P. Strobus, P. resinosa, and P. Banksiana.1 On poor dry sand the two latter species outgrow and supplant the former, while on moist deep sand P. Strobus is the more vigorous. |
 | | Its growth is much aided by the presence of organic matter and loam in the sand, and on soil of this kind, pure woods of white pine, sometimes several square miles in extent, occur. |
 | | Strobus invariably occupied the better soil where the sand contained a percentage of flish mould. |
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