It is interesting that my tree book do not list Juniper as a user name under Tamarack (Larix Laricina), it does mention American Larch and Hackmatack. Juniper comes up under Eastern Red Cedar (Juniperus virginiana), that is because it is not a true cedar. Tamarack can grow to 60' and yield a 2' trunk making nice sill stock.
I don't have a copy of the book you called up Ken. Is it possible to find it on google books? I do recall form my short stay in Arizona they used Juniper as fire wood. It grew in a short stubby bush like tree, maybe 20' tall with a 6" trunk and twisty.
Jim, you mentioned this before and I found it interesting in that the locals here don't use Juniper as a variable, I am not that far from you. A misnomer? My tree book only covers the Eastern North America and something else may be growing in the West.
Tim