Western spruce budworm host series
An rwl object with 37 tree-level series, standardized in ARSTAN.
Dates range from 1776-1987.
References
Swetnam, T.W., Lynch, A.M., 1993. Multicentury, Regional-Scale
Patterns of Western Spruce Budworm Outbreaks. Ecological Monographs 63,
399–424. https://doi.org/10.2307/2937153
