Early navy planes utilized Douglas fir in their building – biplanes, and tri-planes of WW I. Our suggestion could be to utilize sawdust from Deciduous trees, for instance Oak, Beech, Maple and Elm. The sawdust from these trees breaks down and decomposes relatively quickly, certainly the most suitable choice. https://caidenjpvyu.blogofchange.com/28594216/not-known-factual-statements-about-douglas-fir-sawdust-for-sale