Materials for a flora of central Yukon territory /

Autor Porsild, A. Erling
Vydáno 1975

The flora of disco island and the adjacent coast of west Greenland : with remarks on phytogeography, ecology, flowering, fructification and hibernation /

Autor Porsild, Morten P., Porsild, A. Erling
Vydáno 1920