Royal Horticultural Society encyclopedia of conifers : a comprehensive guide to cultivars and species /
Auders, Aris G.
Spicer, Derek P.
Royal Horticultural Society (Great Britain)
London : Royal Horticultural Society,
2012.
V. 1.  Abies to Picea -- v. 2. Pilgerodendron to Xanthocyparis.
Conifers