CONTRIBUTIONS FROM THE NEW YORK 
BOTANICAL GARDEN—No. 224. ¢—"" 
PHYTOGEOGRAPHICAL NOTES ON 
THE ROCKY MOUNTAIN REGION 
IX. WOODED FORMATIONS OF THE 
MONTANE ZONE OF THE SOUTHERN 
ROCKIES 
P. A. RYDBERG 
NEW YORK 
1920 
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Reprinted, without change of paging, from BULLETIN 0 v fHE ToRREY BoTANicaL Civ 
47; 441-454. Oct wet 29, 1920. ADR 1 19? 99 
were 
