Krug, J.C.; Cain, R.F. 1974: Canadian Journal of Botany 52(3): - 591 - 602 -.
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| Krug, J.C.; Cain, R.F. 1974: Canadian Journal of Botany 52(3): - 591 - 602 -. |
| Krug, J.C.; Cain, R.F. 1974: Canadian Journal of Botany 52(3): - 591 - 602 -. |