Try forestry...Aspens have a huge dense canopy.
Other than OSB there is no market for Aspen timber.
Making the logs not worth very much.
Here in NH there are not any sawmills that want Aspen/Popular at all. Other than to use for pallet boards. Which makes the timber almost worthless.
That is why Canadian and northern US OSB mills started using it. It chips up well and it is light/not too dense. Plus they could buy the timber for almost nothing. So, their cost of materials to make OSB Board out of was very low.
The advent of OSB basically put almost all the sheathing plywood mills out of business.